Pfizer,Merck,Novartis,and Other Pharmaceutical Companies Have Little Choice but to Engage

Pfizer,Merck,Novartis,and other pharmaceutical companies have little choice but to engage in global marketing since:

A) there is little demand for their products in home countries.
B) their research centers are located overseas.
C) no single market is large enough to recover costs incurred in research.
D) there is more demand overseas for their products.
E) technology is not available in home countries.