Which of the following has the LONGEST wavelength A.) a lion growling at a frequency of 85 Hz
B.) a bass guitar playing a note at a frequency of 150 Hz
C.) a man speaking at a frequency of 520 Hz
D.) an opera singer singing at a frequency of 2100 Hz

D.) an opera singer singing at a frequency of 2100 Hz

Explanation:

Wavelength is inversely proportional to frequency.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

that tool would be a compass