Concept:Antonyms are words with opposite meanings. The correct word must fill the gap and contrast with “loyal”.
Explanation:The word “loyal” means faithful and committed to a person or duty.
The sentence compares the first wife and the second wife.
So, the missing word should mean the direct opposite of “loyal”.
“Unfaithful” means not loyal or not keeping one’s promises.
The other options, “unkind”, “selfish”, and “hostile”, do not directly oppose “loyal”.
Therefore, “unfaithful” correctly completes the sentence.
Answer:A. unfaithful