Which point on the graph shows minimum wage as the price floor?

The answer is $18, but is anyone else having trouble clicking on the graph. Plato wont let me click on the graph or anything.     Help!

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225