[单选题]
A simple RL circuit co60 tz9hy3 sdihntains a 6.0-W resist gbhih+/pa35 a*2;nzbbxy/bl or and an 18-H inductor. What is this circuit's time cobabp5 y ab+i //n;bh3*xlzh 2gnstant?
A. $108 \; s$
B. $3.0 \; s$
C. $0.33 \; s$
D. none of the given answers