Out of all given options, “whom Allen hired to paint his house” identifies as the subordinate clause in the given sentence.
Answer: Option D
<u>Explanation:
</u>
A subordinate clause is a phrase which cannot stand independently, thus being dependent on a sentence. If added it can give more meaning to the sentence. By adding a subordinate clause, it gives more meaning to the sentence.
In this case, 'whom Allen hired to paint his house' is a subordinate clause as this phrase cannot stand independently if made to do so. A subordinate clauses usually initiates with a conjunction. Since it cannot stand independently, subordinate clause is also referred as dependent clause.