PT119 · S4 · Q21 Pizzerias are the only restaurants

This establishes that the 2nd sentence is also something distinct about pizzerias. But since this answer doesn't contain the wording "utilize direct-mail more effectively" (and neither did the evidence), there's no way to combine this with the evidence and derive that pizzerias "utilize direct-mail more effectively. If I'm trying to prove A = Z, you can give me lots of fun facts about A, like A = B, and B = C, and C = D. But if I don't have any facts about Z, I'll never be able to derive that A = Z.

This doesn't give us a rule that says, "If xyz is true, then you utilize direct-mail marketing more effectively". But at least it does talk about utilizing direct-mail marketing. If this answer allowed us to prove that other restaurants don't utilize direct-mail marketing at all, then maybe we could prove that Pizzerias utilize it more effectively (but we were never actually told that Pizzerias utilize direct-mail marketing either). Regardless, this answer does not allow us to say that other restaurants do not utilize direct-mail marketing. We know that all non-pizzeria restaurants fail to routinely record the names / addresses / menu selections of their customers. But it's still possible that sometimes they do, so we can't trigger this rule and derive that other restaurants don't use direct-mail marketing at all.

This establishes that the 2nd sentence is related to the 1st one (which we pretty much already knew). And more importantly, this answer doesn't contain the wording "utilize direct-mail more effectively", so it's functionally useless to us.

This answer doesn't contain the wording "utilize direct-mail more effectively", so it wouldn't allow us to derive that wording in our conclusion. If we knew that other restaurants "cannot identify regular / average / infrequent" customers, then this answer would allow us to say that utilizing direct-mail marketing is rarely beneficial for them. But, (A) we don't know that. These other restaurants might be able to identify regular / avg / infrequent customers. (B) establishing that direct-mail marketing is rarely beneficial for them is not the same as proving that they use direct-mail marketing less effectively.