Why don't you give me a call and we'll _______ a CHAT?
C
Correct answer
Explanation
After 'will' (in 'we'll'), we use the base form of the verb, so 'have' is correct. This forms the future tense construction 'will have'. Option A 'has' is third-person singular present, incorrect after 'will'. Option B 'had' is past tense, also wrong. Option D 'having' is a participle that doesn't work in this position without an auxiliary verb.