Why Has the Pharmaceutical Industry Drastically Cut Resources Devoted to the Development

Why has the pharmaceutical industry drastically cut resources devoted to the development of new antibiotics? (Select all correct choices)

A) The pharmaceutical industry views the period of time antibiotics need to be taken as too long, making it difficult to keep supply and demand in balance.
B) The pharmaceutical industry views the period of time antibiotics need to be taken as too short, making it difficult to maintain profitability.
C) Pharmaceutical companies view the inevitability of microbial resistance acquisition as a barrier to profitability since drugs that take a long time to produce will have a short market life.
D) Pharmaceutical companies view the holding back of drugs of last resort, such as vancomycin, as sufficient to shore up the problem of drug resistance acquisition.