In carbohydrates, the alpha or beta isomer is based on the group on the first carbon in the ring structure.

The atomic nucleus made up from protons (yellow) and neutrons (blue) and held together by nuclear forces. nuclear forces (also known as nuclear interactions or strong forces) are the forces that act between two or more nucleons. they bind protons and neutrons (“nucleons”) into atomic

Answer two atoms of oxygen;

Ithink the answer is b.