ACCorDing to pArAgrAph 3, onE signiFiCAnt DiFFErEnCE BEtwEEn thE FAthEr AnD mothEr's rolE in ChilD-rEAring is ______.
A．thE stylE oF plAy EnCourAgED
B．thE Amount oF timE AvAilABlE
C．thE strEngth oF EmotionAl tiEs
D．thE EmphAsis oF intEllECtuAl DEvElopmEnt