The way you wrote those options, it would seem that none of them are correct. You can eliminate A and C immediately, because in A, the infinitive form of the verb salir is used (when you should use the present form), and in C, the form salis refers to vosotros/vosotras, not to ellos.
This means that the correct answer has to be B, but you've misspelled sales - it should be saleN. If that is the case, then you should definitely choose B.
En el restaurante Sol de México se come muy bien.
It is an impersonal sentence because it has no subject. This case is used "<u>se</u>", it is when we want to talk about the subject.
In this case we want to talk about how well you eat in a restaurant.
<h3><em><u>MissSpanish</u></em></h3>
