Which Argument(s) for the Increasing Use of Solar Energy Is/are

Multiple Choice

Which argument(s) for the increasing use of solar energy is/are valid?
I.Solar cells are becoming cheaper and increasingly more efficient
II.The cost of generating electricity from fossil fuels is increasing
III.Limited and uncertain supply and the increasing requirements for pollution control are raising the cost of using fossil fuels

A) I only
B) II only
C) I and III only
D) I,II and III