Who taught her such things?

The correct answer is: D. By whom was she taught such things?

The other options are incorrect because they do not use the objective case of the pronoun “whom.” The objective case is used for the object of a verb or preposition. In this case, the verb is “taught” and the preposition is “by.” Therefore, the correct pronoun to use is “whom.”

Here is a brief explanation of each option:

• A. Who was she taught such things by? This option is incorrect because it uses the subjective case of the pronoun “who.” The subjective case is used for the subject of a sentence. In this case, the subject of the sentence is “she.” Therefore, the correct pronoun to use is “whom.”
• B. She was taught such things by who? This option is incorrect because it does not use a preposition. The preposition “by” is necessary to show that “who” is the object of the verb “taught.”
• C. By whom she was taught such things? This option is incorrect because it uses the subjective case of the pronoun “she.” The subjective case is used for the subject of a sentence. In this case, the subject of the sentence is “she.” Therefore, the correct pronoun to use is “whom.”
• D. By whom was she taught such things? This option is the correct answer because it uses the objective case of the pronoun “whom.” The objective case is used for the object of a verb or preposition. In this case, the verb is “taught” and the preposition is “by.” Therefore, the correct pronoun to use is “whom.”