Many of the Reactions Studied in This Chapter Are Stereospecific

Many of the reactions studied in this chapter are stereospecific. Why are stereospecific reactions important?

A) All of the choices are true.
B) Often stereoisomers of a particular compound will have very different biological effects on an organism. Only one isomer is biologically helpful, and the other may be harmful.
C) When a reaction produces a mixture of enantiomers, it is often very difficult to separate them. A mixture of products is often not useful.
D) Often only one stereoisomer is biologically active, and coupling reactions are often used for the production of biological materials.