Which of the following is true about transcription? a both sides of DNA are copied in transcription

b transcription begins at a start codon and ends at a stop codon

c transcription requires DNA polymerase

d codons are composed of four amino acids

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

it's c. (to reduce the greenhouse effect/carbon gasses)

what are the options