According to some researchers, ______ in the body can give rise to. certain mental changes.

A．TT has been in existence for decades.
B．Many patients were cured by therapeutic touch.
C．TT therapists are often employed by leading hospitals.
D．More than 100,000 people are undergoing TT treatment.

A．they didn't take the offer seriously
B．they didn't want to risk their career
C．they were unwilling to reveal their secret
D．they thought it was not in line with their practice