The ATP-DNA thing is a typical Biochem question. They want you to think what would halt first, if ATP was not present at all in the body. Where is it found in amples? The SUGAR-PHOSPHATE backbone in the helix. Therefore, ATP is most important to DNA. In order to make protein, yes, ATP is needed, but not as much as would be for DNA synthesis. Proteins are made on ribosomes with nucleophilic attack between the sugar on one tRNA-complex and the phosphate on the OTHER t-RNA complex. Furthermore, if you don't have DNA, you can't make protein. Therefore, I would pick DNA and not protein.
Three capaciors in parallel=C+C=C = 3C
Three caps. in series = C/3. (C divided by 3)