In this case, you're asked to create a calculated field that:

Filters dependent records

Includes only child relationships

This means:

The worker has multiple dependents (a multi-instance field).

You need to extract only those dependent(s) where the relationship is “Child”.

To achieve this in Workday, use:

True/False Condition → check if the relationship descriptor = "Child"

Extract Multi-Instance → filters the multi-instance field (Dependents) using the above condition to return only matching records

This two-step logic filters multi-instance relationships correctly.

Why the other options are incorrect:

A and B are missing Extract Multi-Instance, which is required to filter multi-values.

C includes Text Constant unnecessarily — only True/False Condition and Extract Multi-Instance are required.