Which of the following best describes the graph of a proportional relationship?

A straight line passing through the origin (0, 0).

Any straight line, regardless of where it starts.

A curved line that passes through the origin (0, 0).

A line that does not have to be straight.

A taxi fare includes a 3 dollar flat fee plus 2 dollars per mile. Is the relationship between the total cost and the miles driven proportional?

No, because the graph does not pass through the origin.

Yes, because the cost per mile is constant.

No, because the cost increases with distance.

Yes, because the graph is a straight line.