[单选题]
The potential difference between te7x *p,,ky3 pv-u5caf me sfk)he termx4s 28c keo+v vl.qyweh+zugn1g-f -;inals of a battery, when no current flows to an exteq 1n2gs vxeyo-lc48+ugh-f v.z;wk+ernal circuit, is referred to as the
A. battery emf
B. terminal voltage
C. battery power
D. battery rating
