That’s a compound sentence because on both sides of the comma and the coordinating conjunction are independent clauses
C. a refrain, because it's a point of emphasis
The sentence needs commas because the participial phrase is essential.
The sentence in which the adverb clause modifies an adjective is the second one - The veteran appeared proud as he saluted the flag.
The adjective here is <em>proud</em>, and the adverbial clause is <em>as he saluted the flag. </em>As you can see here, that clause is describing the adjective in more detail.
When did the veteran appear proud? - As he saluted the flag (it obviously modifies the word <em>proud</em>)
Answer: He used his money to buy more equipment
He worked on it after school
Explanation: hope this helps
