Final answer:
The chef on "Roxy's Grilled Cheese" food truck would cook grilled cheese sandwiches, which is indicated by the truck's name.
Step-by-step explanation:
The chef on the food truck "Roxy's Grilled Cheese" would most likely cook grilled cheese sandwiches. Given the truck's name, it is reasonable to deduce that grilled cheese sandwiches are their signature dish. This type of food truck would focus on creating a variety of grilled cheese sandwiches, possibly with different types of cheeses and breads, and could even include additional toppings like tomatoes, bacon, or different sauces to cater to a wide range of tastes. Therefore, the correct answer to the question is A) Grilled cheese sandwiches.