Choose the option that is the direct form of the sentence.

My neighbour enquired how my father was.

My neighbour enquired, “How is your father?”

The direct form of the sentence should accurately represent the original inquiry made by the neighbor. Here, the neighbor's question is about the welfare of the speaker's father.

So, the direct form of the sentence would be:

"My neighbour enquired, 'How is your father?'"

This option correctly conveys the neighbor's inquiry about the speaker's father.