"scrutinize" ( Line 2, Para. 6) most probably means ______.

A．they answer a call with locator badges
B．the wireless system begins to function
C．staff can watch them through a wall unit
D．infrared signals can detect their presence

A．she could not work as a professional
B．she could not feel trust from the hospital
C．she could not get used to being watched
D．she could not show confidence in her job