[单选题]
A simple RL circuit conta 6(qr,qzj z-+6mbr btf 14:- ef.wqdnnvfp hr.ins a 6.0-W r. b5, 3/kxdbpjuy/ r ohf2jtm1esistor and an 18-H inductor. What is this circuit's timemr,f1xuokp/b2d.t5 hjj 3y /b constant?
A. $108 \; s$
B. $3.0 \; s$
C. $0.33 \; s$
D. none of the given answers
