Since Katara lost her mother’s necklace in a previous episode, Aang made her a new one from Sokka’s fishing lines.
This is a compound sentence, because it has two independent clauses: 1. Melanie is going + but (conjunction) + 2. Valerie is staying home.
Relative clauses are types of dependent clauses complete independent sentences - they usually refer to a single word and modify them. Here, in this excerpt, the relative clause would be that we can see in nature. Relative clauses usually begin with pronouns such as who, what, that, etc.
The answer should be "slow" the first pairing both end in "-est" making them superlatives giving a parallel in the structure. Following the same structure, the words from the pairing after can be ignored, the word dim is an adjective, "light" bulb is a noun, therefore, it is not a parallel structure.
