This question does't seem like GMAT CR question.
We are vacillating between B and E.
In both option, we need to assume something and both assumption can be true.
Let's discuss first E,
Average number of visitors is 2.3 per patient.
Though it is not mentioned that visitors buy snacks from vending machine or not, we assume that they will buy more drinks and vendor is placing 500ml bottles for those visitors.
Now come to B,
Revenue from 500ml bottles is 5% less than 500ml cans.
Here we have to assume that only patients has access to vending machine.
But see, Kooclaka is doing business and must not be restricted to only patients.
I think E is better than B.
gmatexam439 wrote:
Kooclaka is a full-line vending business, which uses vending machines to sell cans or bottles of soft drinks and individual packages of snacks. When the management of Kooclaka considered whether to fill vending machines in hospitals with 330ml or 500ml cans or bottles, it decided to sell only 500ml bottles, because patients do not leave their beds very often, thus they prefer a larger, reusable bottle.
Which of the following, if true, most seriously weakens the argument above?
A. All Kooclaka’s products are manufactured by the same manufacturer. --Doesn't matter
B. The revenues from selling 500ml bottles are 5% less than for 500ml cans. --Correct. If cans make more profit for the firm then cans should be prefered over bottles
C. Kooclaka’s competitors sell only 500ml bottles in hospitals. --Doesn't matter.
D. More 330ml bottles than 500ml bottles can be put in a vending machine. --Few people will but 330ml
E. The average number of visitors is 2.3 per hospital patient. --This strengthens the argument