According to the next, doctors are most successful when they are _________.

A．advise them on ways of giving a product customerappeal
B．accept responsibility for giving a product custoalerappeal
C．advise them on the best time to go ahead with production
D．consult them during the design and development stages

A．may die thousand deaths
B．should take more thoughtful exercises
C．get rid of the idea of risking so as to succeed
D．take the risk of failure