Which of the Following Statements Is FALSE

Which of the following statements is FALSE?

A) A new RNA molecule can begin to be synthesized from a gene before the previous RNA molecule's synthesis is completed.
B) If two genes are to be expressed in a cell, these two genes can be transcribed with different efficiencies.
C) RNA polymerase is responsible for both unwinding the DNA helix and catalyzing the formation of the phosphodiester bonds between nucleotides.
D) Unlike DNA, RNA uses a uracil base and a deoxyribose sugar.