If Congress questions how the Department of Energy is enforcing the policy on disposal of nuclear waste, Congress can use to call a hearing to question Department of Energy officials on the results of a congressional investigation.

Its oversight function

Explanation:

 According to the given question, the congress can using its oversight function for monitoring supervising and also reviewing all its activities, policies implementation process and functions.

 The main purpose of  department of energy is that it helps in advancing the economical and the national securities by implementing various types of policies.

According to the given question, the oversight function plays an important role for developing various types of legislative proposal in the department of energy. Therefore, Its oversight function is the correct answer.  

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.