DIVIDE([Total Sales] - [PY Sales], [PY Sales])

[Total Sales] / [PY Sales], although it sounds technically credible, it does not align with how DAX functions propagate context in this scenario.

[Total Sales] - [PY Sales], however, this wording confuses row context, filter context, or evaluation timing and therefore misses the exact DAX behavior being tested.

CALCULATE([Total Sales], DATEADD('Date'[Date], -1, YEAR)), although it sounds technically credible, it does not align with how DAX functions propagate context in this scenario.

A syntax-level statement that appears valid but actually describes iterator usage in a context where scalar evaluation is required