Question

read each sentence and decide whether the underlined portion contains a mistake. if it does, identify the best way to correct or improve the sentence by choosing the appropriate alternative from the answer choices. if the underlined portion requires no correction or improvement, choose no improvement or correction is required. my dad is visiting his sister, which moved to utah. who moved to utah. that moved to utah. what moved to utah. whence moved to utah. no improvement or correction is required.

Explanation:

In English grammar, "which" is used for non - human antecedents. Here, the antecedent is "sister" (a human). "Who" is the correct relative pronoun for human antecedents. "That" can be used for both human and non - human in restrictive clauses, but in non - restrictive clauses (with a comma), "who" is more appropriate for humans. "What" is not a relative pronoun for this kind of relative clause. "Whence" means "from where" and is not relevant here.

Answer:

who moved to Utah.