Fill in the blank with the most suitable verb:
They didn't remember my birthday but you ________.
A verb is used to express an occurrence, action, or state. It is the grammatical centre of the predicate in a sentence.
An auxiliary verb is a verb which gives is used in the formation of tenses, moods, tones, etc.
Option C is correct as didn't remember indicates the use of simple past tense.
The other options are wrong as no other tense other than simple past tense can be used here.
The correct answer is C) did