[单选题]
The total amount of charge that passes through a wire'sdfcwvf01, nl)4 zfkee2)/ stt full cross c6vzq0 i,9xe9smxy k)section at any point per unit of time is referred to a6 9v0 cszxmky)x, qe9is
A. current.
B. electric potential.
C. voltage.
D. wattage.
