From what I remember about the MBTI test is that an introvert will prefer activities that do not involve other people. So even if you don't particularly enjoy reading books the general discomfort of being in a party will outweight your lack of enthusiasm for reading.
In a well administered test though, one of these questions shouldn't significantly impact the final outcome as other questions with different wording will also be used to help gauge your disposition.
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From what I remember about the MBTI test is that an introvert will prefer activities that do not involve other people. So even if you don't particularly enjoy reading books the general discomfort of being in a party will outweight your lack of enthusiasm for reading.
In a well administered test though, one of these questions shouldn't significantly impact the final outcome as other questions with different wording will also be used to help gauge your disposition.