A note, A from a guitar produces a wave of amplitude 4 mm and frequency 1000 Hz. Another note, B from a whistle produces a similar waveform of amplitude 2 mm and frequency 2200 Hz. If the two notes are compared, ____________

A. A has a higher pitch than B
B. A is louder than B.  
C. B has a greater speed than A
D. B is louder than A
E. A and B have the same quality

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Correct Answer: B