[单选题]
An transformer consi kg51.ido ;gkas 4x*- ud6(zx38ext-fj g ax/qxj-bdcqts of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 4 x6j/qe xdu-xfx3c axt*g(b- zq-d j8A, what is the current in the primary?
A. $0.75 \; A$
B. $1.3 \; A$
C. $12 \; A$
D. $48 \; A$
