Question

Fiona and her fellow green committee members are studying the effects of the use of energy-efficient light bulbs. which of these might their study include?

Answer 1

Their study might include determining the pros and cons of using the light bulbs.
After they've determined the good sides of using energy-efficient light bulbs, and the bad sides, they will certainly know the effects that these bulbs produce. Therefore they will decide whether it is a good idea to use them or to move on to something else.