Final answer:
The phrase 'that covered my feet' is an adjective clause, a type of dependent clause that provides additional information about a noun, in this case, 'The blisters'. It contains a subject and a verb, and it describes the noun coming just before it, which meets the definition of an adjective clause.
Step-by-step explanation:
The clause represented by the phrase 'that covered my feet' in the sentence 'The blisters (that covered my feet) hurt' is an adjective clause. An adjective clause is a dependent clause that modifies a noun or pronoun by providing more information about it.
In this sentence, the clause provides additional information about 'The blisters' and describes which blisters the speaker is referring to. It contains a subject ('that') and a verb ('covered'), making it a complete clause, but it cannot stand alone, indicating that it is indeed a dependent clause.
According to our breakdown of clauses, an adjective clause typically begins with a relative pronoun such as 'that', 'which', 'who', 'whom', or 'whose', and it describes the noun just before it. This clause is not an adverb clause since it does not modify a verb, an adverb, or an adjective by answering questions like when, where, why, or how. It is also not a noun clause because it doesn't function as a subject, object, or complement in a sentence, but as a modifier.
While 'relative clause' is a term often used interchangeably with 'adjective clause', in this context, the specific function of the clause is to act as an adjective, and thus 'adjective clause' is the most appropriate answer.