Can someone pick me as the brainlest

Can occur if you do not modify your workout after a break

What is the function of reverse transcriptase in retroviruses? a) it uses viral rna as a template for dna synthesis.b) it converts host cell rna into viral dna.c) it translates viral rna into proteins.d) it uses viral rna as a template for making complementary rna strands.

The first step in treating water from a river or lake is usually