Here's a problem to solve: During most of the year, the air over Boston, Massachusetts, contains a high amount of moisture. Which of the following best explains why there is a high amount of moisture in the air?

Among the 4 following options, which is the correct answer?

- A: Boston is close to an ocean.
 
- B: Boston is at a low elevation.
 
- C: Boston is near many mountains.
 
- D: Boston is far north of the equator.
 