Hi,

Initially, i have chosen C. I still dont understand why this option is incorrect.

Look, the thing is endanger when you are not aware of the things.So, what i think is that cafeteria is endangering the patrons because customers are not aware of the fact that the cafeteria does not wash the apples it sells.

So, i think this can be the assumption. please clarify.

As jeffxujian stated, there is always an option for learning.

This is really a tough one.
first, author states that apples are greasy. what is the mean of greasy? it means clean.

in the conclusion, the author concludes cafeteria is endangering patrons.

I think B is best one.
still heard that assumption will support for conclusion.
if A is the right choice. it contradicts the conclusion itself.

oa has to be E.

A makes no sense

i go with B

I would go for A as well. It seems the best and safest among the rest.