[单选题]
An transformer consists ofb/wcd;i blgh bz:+r(4hv8p ;f a 500-txg+ol63fi qo, gspsfe0 3s4(uurn primary coil and a 2000-turn secondary coil. If t,(6 pgsugslxiofq30 4es+ 3f ohe current in the secondary is 3.0 A, what is the current in the primary?
A. $0.75 \; A$
B. $1.3 \; A$
C. $12 \; A$
D. $48 \; A$
