Answer: D) whose and D) child.
Explanation: A relative pronoun is a type of pronoun that often introduces dependent clauses (a phrase that doesn't have complete meaning on its own) in sentences. They also can stand alone as the subject or object of a sentence. The relative pronouns are: who, whoever, whom, whomever, that, which, when, where, and whose. In the given sentence, the relative pronoun is "whose" (we can see that it introduces the dependent clause "whose shoes were untied") and it is referring to the child (who was the one with the untied shoes).
