PT 40 S1 Q21

Pizzerias are the only restaurants that routinely record the names, addresses, ... ...

Which one of the following, if assumed, enables the argument's conclusion to be properly inferred?
(A) Restaurants other than pizzerias cannot easily identify regular, average, and infrequent customers.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Necessary Premise: Intro Set