Marco bought a gallon of gasoline for $2.65 per gallon and c cans of oil for $3.15 per can. A: what expression can be used to determine the amount of oil?
B: 9.4 gallons of gasoline in 5 gallons of oil how much did he spend in all?

choose an expression that represents the amount that Marco spent in all
A: 2.65g + 3.15c
B: 2.65g x 3.15c
C: 2.65c x 3.15g
D: 2.65c + 3.15g