Final answer:
The general reserves and level 1 reserves of the Reserve Corps in the United States are required to volunteer a certain number of hours per month. The specific requirements can vary, but it is typically around 40 hours per month. Correct option is B.
Step-by-step explanation:
In the United States, the Reserve Corps refers to the reserve components of the Armed Forces, such as the National Guard. The amount of time that general reserves and level 1 reserves need to volunteer can vary depending on the branch of service and the specific requirements set by that branch.
For example, in the Army, the current drill requirement is one weekend per month and two weeks per year. However, there have been discussions about increasing this requirement to up to seven weeks per year. The specific number of hours per month that reservists need to volunteer can also vary but is typically around 40 hours per month.
Therefore, the correct answer to the question would be B) 40 hours per month.