You want to set such that when you type Baishakh and drag the fill handle, Excel should produce Jestha, Aashadh and so on. What will you set to effect that?
Tap an option to check yourself.
Answer: A) Custom List
Custom Lists let Excel auto-fill a user-defined sequence such as Nepali month names when dragging the fill handle.
Source: Scan #46 page 2 Q290