Fill in the blank with a suitable preposition.

She was anxious _______ her mom’s health.

a) To
b) About
c) By
d) At

Hint: A preposition is a word governing, and usually preceding, a noun or a pronoun that expresses a relation to another word.

Complete answer:

In the given question, we have to use the preposition that fits into the sentence where ‘I’ is anxious when it comes to the ‘mom’s health’.
Let us analyze the options given to us in this question:
Option (a.), ‘to', refers to a proposition that when used in this sentence, will indicate excitement to do something.
Therefore, option (a.) is incorrect as the correct preposition will indicate that ‘I’ is being worried about her mom’s health.

Option (b.), ' about ', refers to a proposition that indicates something concerning a particular subject.
Therefore, option (b.) is correct, because here, ‘about’ is used with 'anxious' to show that ‘I’ is being worried about her mom’s health.

Option (c.), ‘by', refers to a preposition that denotes an agent or a means.
Therefore, option (c.) is incorrect. The correct preposition will indicate that ‘I’ is being worried about her mom’s health.

Option (d.), ‘at', refers to a preposition that denotes a specific place or time.
Therefore, option (d.) is incorrect as the correct preposition will indicate that ‘I’ is being worried about her mom’s health.

Note: In this question, keep in mind that every preposition alters or modifies the meaning of the verb given, therefore, it is important for you to gauge which definition of the verb is being talked about, and thus which preposition will suit it.