How Will the Body Respond If a Normal Biosynthetic Pathway

How will the body respond if a normal biosynthetic pathway is blocked?

A) The body will develop a different and completely new pathway to replace the blocked pathway.
B) The body will not be able to produce the compounds of the blocked pathway and will eventually die.
C) The body will use the reverse of the degradation pathway to make the necessary compounds.
D) The body will not be affected by the blockage of a biosynthetic pathway.