[单选题]
The potential difference be3 uhuxt/q:r;n4 8najhtween the terminals of a battery, u8hnc6 by5:5v jgkj9bz6xgp.when no current flows to an externalgu6h5vb cz .:pjg986nj5 ykbx circuit, is referred to as the
A. battery emf
B. terminal voltage
C. battery power
D. battery rating
