Teachers can improve a student's self-esteem by
a. discouraging imagination.
b. controlling the learning environment.
c. being critical of their work.
d. letting a student set his or her own goals.

The answer is D. letting a student set his or her own goals.This gives students more control on what they want to do and encourages learning.  The teacher though still plays an important role in guiding the students and setting up how to go about the assignments.

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.