The simple subject would definitely be "Many" because these "Many" are the people do something, which leads us to the predicate. The simple predicate would be "were sent" or "sent" because that is what the "Many" were doing (technically they were forced).
A. that she couldn't catch her breath/fast
EXPLANATION
An adverbial clause is a dependent clause that functions as an adverb; that is, the entire clause modifies a verb, an adjective, or another adverb.
In the example, the adverb clauses "that she couldn't catch her breath" and "fast" modifies the verb "run".
As with all clauses, an adverb clause contains a subject and predicate, although the subject as well as the verb may sometimes be omitted and implied.
Went
My grandparents WENT for a walk in the park