Regulating the manufacture of is the function of rna
a. proteins
b. cells
c. energy

The answer to this question is "a."

RNA is involved in the formation of proteins. To make a certain protein, the cell first uses the information in a particular gene to direct the formation of a single-stranded  molecule, and this molecule is called RNA. This process is called transcription.

One type of RNA is called messenger RNA and  the information it contains is used to direct the formation of a specific protein by a process called translation, with the help of cellular structures known as ribosomes.