Which protein is found in the maximum amount______________.
A) Catalase
B) Zinc carbonic anhydrase
C) Transferase
D) RUBISCO

Hint:Proteins are the macromolecules that are formed by the amino acids. Amino acids are combined with the help of peptide bonds to form the protein molecules. There are 20 amino acids that exist in all kinds of proteins.

Complete answer:
>Catalase is a most commonly found enzyme in all the living organisms that are exposed to the Sunlight such as plants, animals, and bacteria. It is present in large amounts also. Catalase catalyzes the decomposition of hydrogen peroxide to water and Oxygen. This enzyme plays a very important role in protecting the cell from oxidative damage by reactive oxygen species. One catalase enzyme can convert millions of hydrogen hydroxide molecules to water and oxygen.
>Zinc carbonic anhydrase: A carbonic anhydrase is also called as the carbonate dehydrogenase. It is a type of enzyme that rapidly catalyzes the conversion of carbon dioxide into a proton and bicarbonate ion. In the zinc carbonic anhydrase the zinc plays a role in facilitating water to create a proton and a nucleophilic hydroxide ion.
>Transferase: A transferase is a kind of enzyme that helps in transferring a specific functional group from one molecule to another molecule. The molecule that donates the functional group is called a donor molecule while the molecule which accepts the functional group is called as the acceptor.
>RUBISCO: RUBISCO stands for Ribulose-1,5-bisphosphate carboxylase. Rubisco is an enzyme which helps in the carbon fixation by which the atmospheric carbon dioxide is converted by plants and algae to glucose or any other energy rich molecule.
Therefore, it has been clear from the above discussion that Catalase protein is found in the maximum amount.

Hence, option A is the correct answer.

Note: Enzymes are the protein molecules which are used as biocatalysts. Enzymes increase the rate of any reaction without their expenditure. They only provide a new path for the reaction by which reaction can be performed in a short period of time.