Question

We can use the sun's energy without using it up. People have been using solar energy for many years. Solar-powered calculators operate on sunlight. Solar panels use light from the sun. They make the light into electricity. Solar energy provides more than electricity. It helps plants grow. Solar energy warms the earth daily. Solar energy is ________.
Aimaginary Bcostly
Cabundant Dnational

Answer 1

C abundant — the passage says we can use the sun's energy without using it up and it warms the earth daily, so it's plentiful (abundant).