[单选题]
A simple RL circuit contains a 6.0-W resis+r;ema8h d3frdzu)/v rgqho 1j37 d )rtor and an 18-H inductoraz8:, 4ug7n5 ft hhj jc(/mrmb. What is this circuit's time48 nm,azjbtmh (:jch7 /gr5uf constant?
A. $108 \; s$
B. $3.0 \; s$
C. $0.33 \; s$
D. none of the given answers
