The seventh grade wants to break last year's record of 78 coats collected for the annual clothing drive. They have already collected 13 coats.

Which number line represents the graph of the solution to the inequality that represents the number of coats, c, that the seventh grade must still collect?

The inequality that represents the number of coats the seventh grade must still collect is \(c > 78 - 13 = 65\). Since the seventh grade must collect more than 65 coats, the number line starts at 66 and extends indefinitely to the right. So, the number line that represents this solution is:

\[66 \, , \, 67 \, , \, 68 \, , \, \ldots\]