Why is it necessary to acidify the mixture obtained after the reaction of methyl benzoate with phenylmagnesium bromide?

Select one:
a. To convert benzophenone to triphenylmethanol
b. To convert phenylmagnesium bromide to benzene
c. To convert magnesium turnings to magnesium sulfate
d. To convert triphenylmethoxymagnesium bromide to triphenylmethanol and to avoid precipitation of HOMgBX