Unexpected outcomes may arise in production when using only sanitized data for the testing of applications.
Sanitized data is data that has been purposely and permanently deleted or modified to prevent unauthorized access or misuse. Sanitized data may not reflect the real characteristics, patterns, or behaviors of the original data, and thus may not be suitable for testing applications that rely on data quality and accuracy. According to NIST, data sanitization methods can affect the usability of data for testing purposes1. The other options are not risks introduced by using sanitized data for testing applications, but rather risks that can be mitigated by using sanitized data. Data loss, data disclosure, and breaches of compliance obligations are possible consequences of using unsanitized data that contains sensitive or confidential information. References: 2:
What is Data Sanitization? | Data Erasure Methods | Imperva 3: Data sanitization techniques: Standards, practices, legislation 1: Data sanitization - Wikipedia

Reviewing the new standard for applicability to the business is the first course of action, as it helps to understand the changes, gaps, and impacts of the revision on the organization's security posture, compliance status, and business objectives. Evaluating the cost of maintaining the certification, modifying policies to ensure new requirements are covered, and communicating the new standard to senior leadership are important steps, but they should be done after reviewing the new standard for applicability to the business.
References = CISM Review Manual 2022, page 361; CISM Exam Content Outline, Domain 1, Task 1.2

Security requirements should be defined concurrently with other requirements to ensure that security is built into the software development process from the beginning and not added as an afterthought. This will also improve the efficiency of the development process by reducing the need for rework and testing. Security requirements should be based on the business objectives, risk assessment, and security policies of the organization, not on code review, security assessment tools, or functional requirements. References = CISM Review Manual 15th Edition, page 1241; CISM Item Development Guide, page 62