ACCorDing to thE proFEssor, whiCh oF thE Following CAusEs thE Evolution oF A gAs ClouD into A stAr
A、thE intErnAl grAvity oF thE ClouD、
B、thE thErmAl prEssurE oF thE ClouD、
C、thE intErplAy BEtwEEn thE ABovE two FACtors.
D、thE liFEtimE oF thE gAs ClouD、