Why don't you ______ her a call, or better still go and see her in person?
C
Correct answer
Explanation
After 'Why don't you' (which introduces a suggestion), we use the base form of the verb 'give'. This construction is used to make suggestions or recommendations. Option A 'gave' is past tense, inappropriate for a suggestion. Option B 'given' is a past participle that needs a helper verb. Option D 'giving' is a present participle that doesn't work as the main verb in this suggestion structure.