How long have you been playing the trumpet?
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About four years
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For four years.
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Around four years
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Many years
B
Correct answer
Explanation
When answering 'how long' questions about actions continuing to the present, we use 'for' + time period. 'For four years' follows this pattern. 'About four years' and 'Around four years' lack the preposition, and 'Many years' is vague without 'for'.