[单选题]
The intensity at a disi (3z.hquze9sthj vu+ ,y*nl1tance of 6.0 m from a source that is radiating equally in all directions i1* ytj, nh+uvls $6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?
A. $18 \; dB$
B. $23 \; dB$
C. $28 \; dB$
D. $32 \; dB$
