{{B}}pAssAgE two quEstions 19 to 21 ArE BAsED on thE pAssAgE you hAvE just hEArD、{{/B}}

A．BECAusE Boys AnD girls ArE BEing prEpArED For DiFFErEnt soCiAl rolEs.
BECAusE Boys ArE morE CourAgEous.
C．BECAusE toy mAkErs wAnt to DivErsiFy thEir proDuCts.
D．BECAusE pArEnts hAvE DiFFErEnt ExpECtAtions For Boys AnD girls.