in thE Fourth pArAgrAph, why Do mAny CompAniEs prEFEr to DivErsiFy rAthEr thAn stAy in A ConCEntrAtED mArkEt
A．to rEDuCE thE risk
B．to sprEAD thE risk
C．to EArn A high rAtE oF rEturn
D．to strEngthEn thE mArkEt position