thE BEst AltErnAtivE titlE For thE pAssAgE will BE______.
A．A stuDy oF wEED CommunitiEs
B．thE importAnCE oF stuDying how plAnts livE in CommunitiEs
C．how hErBiCiDEs mAy AFFECt FArm lAnD
D．wEED Control By mEAns oF hErBiCiDEs