请选择CBA7n0i:z6] I’m going to send______ email _______ my mum.-a,q1^6b1K5E-R2m'g
A. an, to-a,q1^6b1K5E-R2m'g
B. an, for-a,q1^6b1K5E-R2m'g
C. a, to-a,q1^6b1K5E-R2m'g