Which power source has been least developed

a) wood

b) wind

c) biofuel

d) hydroelectric

b) Wind.

Explanation:

Wind power is the manipulation of air flow by wind turbines to produce the mechanical power to utilize electric generators. Wind power, as a choice to consuming fossil fuels, is abundant, renewable, broadly shared, neat, generates no greenhouse gas discharges through development, uses no water, and utilizes the small land. But this source has been, unfortunately, least developed by the developed nations.

The answer to your question is D) Hydroelectric.