If There Are Twelve Different Intermediate Products Produced in the Stages

If there are twelve different intermediate products produced in the stages of a metabolic pathway within a cell,we can expect that there

A) is one enzyme that carries this process through to the end product.
B) is one enzyme for degradation and another enzyme for synthesis.
C) may not be any enzymes involved if this is a natural cell product.
D) must be twelve different raw materials combined in the cell by one enzyme.
E) are about twelve enzymes,at least one responsible for each step in the metabolic pathway.