Answer:
B. Erik
Explanation:
This is the only scenario that describes something forgotten
Have you ever done community service or helped lead a big project? Even just some nice things you've done for your school.
C. It decreases in wave speed.
<span>Period of a wave is the time needed for one complete cycle of vibration to pass a given point. Frequency and period have a reciprocal relationship. Frequency can be similarly thought of as speed of a wave.</span>
