The answer is c (ecstatic)
For the first question, the answer would be D. (It supports the idea that living in a foreign country is the smartest way to learn a new language)
D: Language researchers found that students who lived in a foreign country learned the new language sixty-five percent faster than students learning at home.
The counterclaim is something that counteracts the statement. Therefore, for the second questions, the answer should be B.
B: However, learning to play an instrument has been proven to improve grades and test performance.
The correct answer is "Few in the band have learned all of their music yet". When a verb agrees with its pronoun subject, it needs to sound natural. "Neither" and "either" always agree with a verb in singular form, and "anybody" agrees with a verb in the singular form as well.
Foreshadowing
Usually someone in the story will try to sound cool but in all honesty they know exactly what's going down