She asked me if I knew a person who could teach her French, I said I wasn’t. A. do not know B. didn’t C. hadn’t D. No improvement

The correct answer is: B. didn’t

The sentence is in the past tense, so the verb “know” should also be in the past tense. The other options are incorrect because they are not in the past tense.

• A. do not
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  know is in the present tense.
• C. hadn’t is
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  the past participle of the verb “have”, which is not the correct verb to use in this sentence.
• D. No improvement is incorrect because the sentence is not grammatically correct.

Here is a rewritten version of the sentence:

She asked me if I knew a person who could teach her French. I said I didn’t know anyone.