Answer:
A. The clause is "that are not registered"
It is essential.
It does not require a comma.
Explanation:
Relative clauses are clauses that actually contain a subject and a verb. They are known to begin with a relative pronoun (e.g who, whose, whom, that or which) or a relative adverb (e.g when, why or where).
Option A is correct because "that are not registered" is actually a relative which uses "that" (a relative pronoun). Also, it is essential because it answers the question "what kind of cars are towed?". It does not require comma.
The answer is bandwagon. This is because they use the word "everyone" to convince you to agree with the others.
A. It represents the kindness and decency of the speaker's father, which the speaker admires.