The most abundant element in the atmosphere can also be found in white sugar and soy protein. fruits and hydrogenated oils carbonated water and glucose. beans and whey protein.

The answer is: beans and whey protein

The most abundant element in the atmosphere is nitrogen N2 (~78%), followed by oxygen O2 (~21%).

CO2 makes up less than 1% of the atmosphere. Much less for that matter.

The key to the question is knowing that protein contains nitrogen.

Protein is a macromolecule made up of smaller molecules called amino acids. Amino acids are made up of a central carbon (C) and 4 groups:
     amine (-NH2)
     carboxylic acid (-COOH)
     a hydrogen (H)
     a side chain which is different and specific to each amino acid

One can infer amino acids contain nitrogen from their name (amino).

Beans contain a high amount of protein, and whey protein is a type of protein, so both contain nitrogen.