Among the Alternative Sources for Generating Electricity Are

Multiple Choice

Among the alternative sources for generating electricity are
I.batteries.
II.fuel cells.
III.solar cells.
In populated but remote regions where it has proven too expensive or too difficult to establish electrical networks,which is/are the most viable alternative method(s) of providing electricity?

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