The best option to support the organization's objectives of protecting data confidentiality while transporting data is encryption. Encryption is a process of transforming data into an unreadable form using a secret key or algorithm, so that only authorized parties can access the original data. Encryption protects the confidentiality of data in transit by preventing unauthorized interception,modification, or disclosure of the data. Encryption can also help comply with data privacy and security regulations, such as the GDPR and HIPAA.
The other options are not as effective as encryption in protecting data confidentiality while transporting data.
Cryptographic hashes are mathematical functions that generate a fixed-length output from an input, but they do not encrypt the data. Hashes are used to verify the integrity and authenticity of data, but they do not prevent unauthorized access to the data. Virtual local area network (VLAN) is a logical grouping of network devices that share the same broadcast domain, but they do not encrypt the data. VLANs can improve network performance and security by isolating traffic, but they do not protect the data from being intercepted or modified by external attackers. Dedicated lines are physical connections that provide exclusive access to a network or service, but they do not encrypt the data. Dedicated lines can offer higher bandwidth and reliability, but they do not guarantee the confidentiality of the data from being compromised by physical tampering or eavesdropping.
References:
ISACA, CISA Review Manual, 27th Edition, 2019, p. 2471
ISACA, CISA Review Questions, Answers & Explanations Database - 12 Month Subscription2 Data Security and Confidentiality Guidelines - Centers for Disease Control and Prevention3 Information Security | Confidentiality - GeeksforGeeks4

Shadow IT often arises when approved software does not meet user requirements (Option D), leading employees to seek alternative solutions.
ISACA CISA Reference: IT governance frameworks stress the need for user-centric IT policies to mitigate shadow IT risks.
Risk Implication: Shadow IT introduces security vulnerabilities, compliance risks, and potential data breaches.

The best evidence of an IT strategy correction's effectiveness is the synchronization of IT activities with corporate objectives. The IT strategy correction is a process of reviewing and adjusting the IT strategy to ensure that it aligns with and supports the corporate strategy and objectives. The synchronization of IT activities with corporate objectives means that the IT activities are consistent with and contribute to the achievement of the corporate goals and vision. The IS auditor can measure and evaluate the IT strategy correction's effectiveness by comparing the IT activities with the corporate objectives, and assessing whether they are aligned, integrated, and coordinated. The other options are not as good evidence of an IT strategy correction's effectiveness, because they either do not reflect the alignment of IT and business, or they are inputs or outputs of the IT strategy correction process rather than outcomes or results. References: CISA Review Manual (Digital Version)1, Chapter 1, Section 1.2.1

The first step in an incident response plan is typically preparation12. However, among the options provided, validating the incident would be the first step. This involves confirming that a security event is actually an incident3. It's important to verify the event to avoid wasting resources on false positives.
References:
Incident Response Plan: Frameworks and Steps - CrowdStrike
What is Incident Response? Plan and Steps | Microsoft Security
What Are the Phases of an Incident Response Plan? - ISC2 Blog