Mother wondered from __________ her children had gotten the head lice.

A) who
B) whom

I answered b

Right.

Whom

The correct answer to fill in the blank is "whom."

To determine whether to use "who" or "whom," you need to identify whether the word is functioning as a subject or an object in the sentence. If the word is the subject of the sentence or a clause, "who" is used. If the word is functioning as the object of a verb or a preposition, "whom" should be used.

In this case, the word "whom" is a pronoun functioning as the object of the preposition "from." The preposition "from" requires the use of the pronoun "whom" to indicate that it is the object of the preposition. Therefore, the correct answer is B) "whom."