thE purposE oF thE FrEDEriCk ⅱ's ExpErimEnt wAs ______.
A．to provE thAt ChilDrEn ArE Born with thE ABility to spEAk
B．to DisCovEr whAt lAnguAgE A ChilD woulD spEAk without hEAring Any humAn spEECh
C．to FinD out whAt rolE CArEFul nursing woulD plAy in tEAChing A ChilD to spEAk
D．to provE thAt A ChilD woulD BE DAmAgED without lEArning A lAnguAgE