Which statement is true?
a. a sustainable energy source is one that will not run out.
b. a sustainable energy source is one that does not cost very much.
c. a sustainable energy source is one with a high environmental cost.
d. a sustainable energy source is one that can be grown by farmers.

   A.A sustainable energy source is one that will not run out.

Explanation:  Sustainable energy sources are those that do not depend on the amount of natural resources, that is, they will not disappear, and they belong into desirable sources, especially nowadays. This includes wind energy, solar energy,  geothermal energy, hydropower, biomass energy, and is desirable due to increasing pollution, ozone depletion and climate change arising from the use of fossil fuels.

there are no answer given

explanation:

“i think it is very plausible that if there are five votes to end the death penalty, it could be with the people who are on the court right now,” - smith

so basically it is not clearly and consistently imposed