Daisy cooked so many dishes for lunch, but it wasn’t necessary.

Answer A

“Daisy cooked too many dishes for lunch, but that wasn’t necessary.”

=> Daisy shouldn’t have cooked so many dishes for lunch.

The remaining answers:

B, C, D don’t make sense

Structure: – needn’t have PP: shouldn’t need to do anything (because it’s not necessary)

– couldn’t have PP: maybe, could have done nothing

– must have PP: surely