- The air mass formed close to the ocean is humid in moisture
- Boston is a city that is near to the coast of the atlantic ocean
- So, the air mass in boston will be humid in moisture

Therefore, the air mass in boston will be humid in moisture
Question: 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?
Context: - The air mass formed close to the ocean is humid in moisture 
- Boston is a city that is near to the coast of the atlantic ocean