Based on the sentence, the adverbial clause is "after he finishes football practice". Adverbial clause is a set of words that is usually preceded by subordinating conjunctions such as after, if, etc.It usually answers the question when, where, what, how or by how much.
Answer:
D because there is no independent clauses.
The ebony clock effects people with it's strong forceful sound. It draws the attention of people through it's proud chimes.