Explanation: The graph represents the relation between how many dollars were spent on rides and games at the same time once Kiran has just $12 to spend.
First: Once Kiran has just $12 to spend we know the maximum must be 12 rides once 1 ride costs $1.
Second: Let's imagine Kiran spends all the $12 dollars in rides, it means there is nothing left for the games which means she spends $0 on games (number of games = 0).
Third: Now let's imagine Kiran spent just $10 on rides ($10 on rides = 10 rides), so she has still $2 to spend on games. Once each game costs $0.25 it means Kiran is able to pay for 8 games (2/0.25=8) this time.
Fourth: Now let's imagine Kiran spent just $8 on rides ($8 on rides = 8 rides), so she has still $4 to spend on games. Once each game costs $0.25 it means Kiran is able to pay for 16 games (4/0.25=16) this time.
Final answer: As we can see the only graph that represents the pattern represented above is the letter C.