How to graph the relationship between amount left to be paid and monthly payments

Hannah's loan was for $18,000 at 0% interest. Her monthly payment is $300 per month. Which graph best models the relationship between the amount of money left to be paid on the loan and the number of monthly payments?

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With no graph to look at in the asked question, here’s an explanation.

The y-axis would represent the amount left to be paid.
The x-axis would represent the amount of payments made.

The graph would have a y-intercept of (18,000 , 0) {the balance is $18,000 with 0 payments made}
The graph would have an x-intercept of (0 , 60) {the balance is $0 after 60 payments have been made}
The graph would have a slope of -300 {$300 is being paid each month}

$18,000 being paid off at $300 each month would take 60 months.

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