Answer is a) a
Reason. Milk is a drink for children.
It’s not “an” drink for children or “the” drink for children. Unless there is an article somewhere you didn’t post I don’t know what d) no article means.
Answer: Dr. Seward had observed that the Renfield is a lucid.
Explanation:
Renfield used to collect flies and spiders. Steward had appointed a guard outside Renfield's cell to observe and regulate the aberrant behavior.
One night when Renfield screamed from his cell, Seward observed that he was badly hurt. His face was brutally beaten. He realized that Renfield cannot himself inflict wounds on his face, as his back was broken.
Nominative pronouns are i, you, she, he, they, we, it