Which situation is best modeled by the equation 9 plus x equal 16?
A. You have $16 left after spending $19 and some other amount.
B. The price of a water bottle, $9, was decreased by some amount of $16.
C. Nine friends each pay the same amount to get into a theme park, and the total is $16.
D. You pay nine dollars for a burger and some amount for dessert for a total of $16.