Read the claim and reason. claim: our school cafeteria should offer more meatless main dishes. reason: there are a significant number of vegetarians attending our school. what evidence best supports the student’s reason? the results of a student survey suggest that twenty-three percent of the students consider themselves vegetarians. though school food is funded by state and county governments, the menu is determined by school cafeteria staff. salads and meatless pasta dishes add variety to school menus and provide vegetarians with possible choices. vegetarians rely on beans, nuts, and greek yogurt as alternate sources of protein in their diets.

I would pick the first one. It's always nice to get a statistic to back up an argument. 

The source of the money is not really a factor, because the menu is determined by the employees of the school.

Though salads and meatless pasta would add variety to the menu, in itself it is not a reason for switching to these dietary choices. Without mentioning vegetarians, someone could argue that increasing the menu could add expenses. (Vegetarian dishes can be expensive, especially if they involve nuts).

The last one is your second best choice, but again, money becomes a factor. The problem with being a vegetarian (I am one) is not protein. Many things will do and they are cost effective (like beans). The problem is something like B12. Some things like eggs milk and cheese would send a vegan out the door quickly (animal products are plain forbidden). Trust me on this, even vegans have trouble with rice milk or soy milk (unless it is fortified by sugar). These milks are really flat and, well, tasteless.

 First Choice.