Determining Molecule Based on Proton NMR (HNMR)
Your assignment seems reasonable. One thing to keep in mind is that even though  phenyl protons are in different chemical environments, they may be too close to resolve and with a low-field instrument, some may appear as a "blob" of superimposed signals. In this case, the peak from (B) is simply unresolved from that of the (C) protons, giving a single signal that integrates to 3 protons. See here with a 90 MHz instrument. That spectrum is a bit different than the one you have, but the one you've been given may be a simulated spectrum.