The Replicase Enzyme of the SsRNA Phage Qb Has Been

The replicase enzyme of the ssRNA phage Qb has been used by scientists to do which of the following?

A) Synthesize RNA molecules from a DNA template.
B) Measure small amounts of target RNA molecules in a sample.
C) Measure the levels of pathogenic viruses in drinking water.
D) Amplify DNA molecules in a sample.
E) Fuse two pieces of RNA together.