It’s the first one.
The y-intercept represents the value of a graph when the input is 0. The input here is miles, and the output is the cost. So we want to find the cost when the car has travelled 0 miles.
To find the cost at 0 miles, subtract the ROC (rate of change) from the given value for two miles. We see that it increases $4.50 every three miles, so the cost per mile is $1.50.
This means that the initial cost is $17.00- $2(1.50) = $17.00 - $3.00 = $14.00
Thus, when the car has travelled 0 miles, the cost is $14.00