Right answer is (a) Glyceraldehydes’ 3-phosphate
For explanation I would say: Glyceraldehydes’ 3-phosphate, also known as trio-phosphate and abbreviated as G3P, GALP or PGAL, is a chemical compound that occurs as an intermediate in several central metabolic pathways of all organisms. It is a phosphate ester of the 3-carbon sugar glyceraldehydes and has chemical formula C3H7O6P.