Optimism is a （） shown to be associated with good physical health, less depression and longer life.

A．To resolve the dilemma in the health-care system.
B．To maintain America’’s lead in the drug industry.
C．To allow the vast majority to enjoy its benefits.
D．To quicken the pace of new drug development.

A．Low prices will affect the quality of medicines in America.
B．High prices are essential to funding research on new drugs.
C．Low prices will bring about the anger of drug manufacturers.
D．High-price drugs are indispensable in curing chronic diseases.