Answer:spongebob squarepants
Explanation:
Not sure per month, but in a year they make around $127,800. So you could divide that by 12. Which would be 10,650 per month.
D is the correct answer.
In the badly drawn diagram attached, you will find the <em>yellow</em> represents wavelength, which is the distance between identical points on consecutive waves.
The <em>green</em> represents the amplitude, which is the distance between the origin (middle) and crest/trough (top/bottom)