[单选题]
An ideal transformer6m9kv z t5 vjzuj49f-h has 60 turns on its primary coil and 300 turns on itsgh.h* f d;s:vd)ob*vrfje1 e9 secondary coil. If 120 V at 2.0 A is applied to the primary, what current is present in the sec ed) 9f;jhg1:fbsv*ed ohrv*. ondary?
A. $0.40 \; A$
B. $2.0 \; A$
C. $4.0 \; A$
D. $10 \; A$
