Pretty sure the answer would be C.
Riding a skateboard is a phrase
A phrase can not have verb and subject together. riding a skateboard doesn't have subject. the others are clause.they have both subject and verb.
good luck.
What makes human experience authentic is that the human experience as a collective is something that is inherently subjective and unique for each single person
A theme is a central topic,subject,or message within a narrative.
Answer:
From this line, we can infer that kenniston is very responsible; organized. I'm not sure of the entire context of the story, but from this sentence, we can see that kenniston is most likely a natural leader, declining a suggestion (whatever it is) that would prevent him from carrying out his duties/responsibilities.