The antecedent in the sentence is C
This perspective has received significant criticism for its reliance on unvalidated scientific claims, Beliefs can also influence health behaviors.Beliefs about your basic character—who you are as a person on a fundamental This perspective has received significant criticism for its reliance on unvalidated scientific claims, Beliefs can also influence health behaviors. Beliefs about your basic character who you are as a person on a fundamental
The last one, Before his European travel- the highlight of his summer-... ect.
is the right answer
"Swinging in the air" is a dangling modifier in this sentence since it modifies the part of the sentence "by the acrobats" but it is ambiguous or not clear because it may also modify "the children". A dangling modifier is a grammatical contruction that can be misinterpreted because of the way it was written and it can also lead to misunderstanding of a sentence or idea.