Read this sentence. All cars that are not registered will be towed to the nearest impound lot. Identify the relative clause, whether it is essential to the meaning of the sentence, and if it requires commas. Select one: a. The clause is "that are not registered." It is essential. It does not require a comma. b. The clause is "that are not registered." It is non-essential. It does require a comma. c. The clause is "to the nearest impound lot." It is essential. It does not require a comma. d. The clause is "to the nearest impound lot." It is non-essential. It does require a comma.

The correct answer is A. The clause is "that are not registered." It is essential. It does not require a comma.

Explanation:

In grammar, relative clauses are used to define a noun. These can be identified because they begin with words such as that, when, where, etc. In the sentence presented the relative clause is "that are not registered", which defines "the cars".

Moreover, relative clauses are essential if they provide key information and cannot be omitted. This occurs in the clause "that are not registered" because without this it is not possible to know the cars that will be towed. Also, according to grammar rules, essential clauses do not require commas.

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