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Dan and Mario went to a sandwich shop to buy sandwiches for their group of friends. Dan bought 2 tuna and 5 vegetarian sandwiches for $37. Mario bought 4 tuna and 3 vegetarian sandwiches for $39. Which system of equations can be used to solve for the cost of each kind of sandwich?

a. 2x+5y=37
4x+3y=39

b. 2x+5y=39
4x+3y=37

c. 5x+2y=39
4x+3y=37

d. 5x+2y=37
4x+2y=39