[单选题]
The intensity at a distance of 6.0 m frn 0l: h)a rt.,hy)3vydn-otwh om a source that is ramo:ls/-m c w8wdiating equally in all directio/ w:cm-w8mo lsns is $6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?
A. $18 \; dB$
B. $23 \; dB$
C. $28 \; dB$
D. $32 \; dB$
