The correct answer is A. Configure Campaign Interactions and Campaign statistics.
The option text appears to contain an OCR/wording issue. The intended Salesforce feature is Campaign Hierarchies and Campaign statistics. For advertising ROI, Salesforce Campaigns are the correct feature because Campaign ROI reports calculate return on investment using campaign cost and won opportunity value. Salesforce also states that campaign hierarchy metrics roll up from child campaigns to parent campaigns, which helps analyze campaign performance across related marketing efforts.
B is incorrect because Account interactions and roll-up summary fields are not the standard marketing ROI solution.
C is incorrect because changing the whole org to a public security model is unnecessary.
D is incorrect because an opportunity pipeline report alone does not provide campaign ROI analysis.

The correct answer is A. TODAY().
The formula needs to calculate how many whole days have elapsed since a marketing communication was sent. The TODAY() function returns the current date as a Date value, which is appropriate for whole-day calculations. Salesforce documentation also shows that TODAY() can be used with addition and subtraction operators for date calculations.
NOW() returns a Date/Time value and can introduce fractional day/time calculations. DATEVALUE() converts a Date/Time or text value into a Date, but the question asks which function should return today's date for calculating elapsed days. DATETIMEVALUE() returns a Date/Time value, not the desired whole- date calculation.

The correct answer is A. Lookup field.
Cloud Kicks wants to assign a Customer Service Manager user to an Account in addition to the standard Account Owner. The best field type is a Lookup field to the User object. A lookup field stores a relationship to another record and supports reporting, filtering, and record-level navigation. Salesforce describes lookup relationships as a way to relate two records while keeping the records otherwise independent.
A Text field would not create a real user relationship and could cause inconsistent names. A Picklist or Multi- select picklist would require manual maintenance of user names and would not behave like an assigned user reference.

A Screen Flow is required because the process must interact directly with a user and collect input. Salesforce defines screen flows as interactive automation that uses Screen elements and screen components to gather information from running users. After the required information is captured, an Update Records element can locate the related Account and write the supplied values to that existing record. Salesforce ' s Screen Flow documentation specifically describes adding an Update Records element and identifying an Account by its record ID when existing data must be changed. An autolaunched flow cannot contain normal interactive Screen elements. Record-triggered and schedule-triggered flows execute from record or time-based events rather than interactive user input. Create Records is also incorrect because the requirement is to update an existing related Account, not create a new one.