Question

The sun is wonderful source of energy. It is renewable and natural with few dangers. Solar cells rely on the sun for energy. These cells would be more practical to use if they were ________.
A) larger
B) Nonrenewable
C) Pollution-free
D) less expensive

Answer 1

B:nonrenewable i think

Answer 2

I just took the test and the answer is actually D) Because Solar cells transform radiant energy from the sun into electrical energy. It is more expensive, however, than the transformation of thermal energy into electrical energy by combustion. Therefore, solar cells would be more practical if they were LESS EXPENSIVE.