The meaning of the word impairment is having medical symptoms.
What is impairment?
In medical terms, impairment refers to the absence of any significant function in a body. It refers to any loss or inability into a person's body.
The types of impairments are vision impairment, hearing impairment, mobility impairment, and so on.
In the given sentence, the person is suffering form hearing impairment, that is she is deaf.
The word impairment refers to her hearing disability.
Therefore the correct option is D.
Learn more about impairment here:
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