By sAying "suFFEring CAn BE A BlEssing", thE Author mEAns thAt_________.
A．A BAD thing is gEnErAlly FollowED By A gooD thing
B．it is hArD to tEll A BAD thing From A gooD thing
C．A BAD thing somEtimEs CAn Do gooD to pEoplE
D．A thing BAD to onE pErson mAy BE gooD to AnothEr