Increasing the rotating speed, amplitude will get larger and frequency will increase (more rotations per second).
Let us say initial amplitude is 1 (1 box up from midpoint to crest) and frequency is 3 (3 waves shown).
A – frequency increases but amplitude remains the same. This is wrong.
B – frequency increases and amplitude increases. This is correct.
C – Amplitude remains the same. Frequency decreases. This is wrong.
D – Amplitude increases. Frequency decreases. Wrong.
E – Amplitude increases but frequency remains the same. Wrong.