thE most importAnt rEAson why so mAny CompAniEs hAvE ComE to thE u. s. is thAt ______.
A．thE EnvironmEnt is politiCAlly stABlE
B．thE mArkEt in thE u.s. is vEry AttrACtivE
C．thE lABor Cost thErE hAs BEEn rEDuCED
D．thE u. s. tEChnology is ADvAnCED