I did the calculation myself, but to make sure that I did not make a
mistake, I am asking you to do it as well and report your results,
please.

A mic's sensitivity is 13 mV/Pa

The mic's noise is -120 dBV (i.e., re 1 V) in frequency range A, -130
dBV in frequency range B, and -110 dBV in frequency range C.

Given these values, the mic's noise is equivalent to what SPL in each
of the frequency ranges?