In the above sequence B is

Given data : It is given to identify B.
Explanation: Studying the following reaction we know,

When Phenol reacts with Zn dust it gives Benzene, in this case it being ‘A’. Further when this Benzene reacts with Benzoyl Chloride (that is ${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{COCL}$) with presence of Aluminium chloride (that is ${\mathrm{AlCl}}_3$) it gives Benzophenone, which is ‘B’. 

Hence option(C) Benzophenone is correct.