[单选题]
The intensity at a dijr6fee wz9 ):psta h95v6xbqsnjbu7+ u1znce of 6.0 m from a source that is radiating equally in all directionxb9 7+nz5q6bu sjv u1hs 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. $32 \; dB$
