...for Question 1:
C is best, because the speaker is sure of the plans so uses 'gonna' (slang pronunciation of "going to") -- the continuous tense, which use when sure of future plans.
...for Question 2:
All the answer options are okay; the speaker is unsureof his or her plans, so uses 'will' or 'might' with the simple present Tense.
EXPLANATION
It may seem contradictory (against the facts/against other ideas), but will is used...
when we are expressing thoughts about plans in the making (plans we are deciding on/about) or thinking about now -- at the present time.
And we use perhaps, probably, likely to or maybe along with will:
Like this:
"Maybe I'll throw this snowball at the teacher's face!"
(thinking about the action/not sure/deciding)
...
"Nah. I'mnot going to do that....
(The action has been decided upon/it's sure to happen/decided)
...
Because even though he's a nice guy, he'll probably get pissed* at me."
*Pissed means angry in American English and drunk in British English.
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CA