Unclear, confusing. Because the last half doesn't make sense
C.
If your looking for the word, minuscule, your best bet is to look somewhere where it had words related to size, since minuscule is another word for something small.
Answer:
One of his least favorite duties is giving presentations
The first choice has the most reasonable and backed up claim.
Sentence A has a disagreement between "were" (plural) and "no one" (singular).
Sentence B has a disagreement between "was" (singular) and "problems" (plural).
Sentence C, however, has complete agreement between the subject and verb. Therefore, the answer is C.
