whAt CoulD sCiEntists Do iF roBErt's thEory provEs to BE truE
A．thEy CoulD DrivE thE insECts AwAy.
B．thEy CoulD kEEp thE plAnts wEll-wAtErED.
C．thEy CoulD mAkE thE plAnts grow FAstEr.
D．thEy CoulD BuilD DEviCEs to trAp insECts.