If There Are Twelve Different Intermediate Products Produced During Production

If there are twelve different intermediate products produced during production of a molecule in a cell,we can expect that there

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