What Makes Solar Energy an Unreliable Energy Source

Multiple Choice

What makes solar energy an unreliable energy source?

A) Photovoltaic cells have a lot of moving parts that produce noise.
B) Sunlight is intermittent,especially in high-latitude locations.
C) It has expensive start-up costs.
D) All of these answers are correct.
E) Sunlight is intermittent and solar energy has expensive start-up costs.