Answer:
I think it's the second one ( Any two points on the line will produce the same slope)
Explanation:
Any two points on a line will ALWAYS have the same slope. There's no way that it won't be that way. That's why you are able to choose any two points on a graph to find a slope.
For the first one, i think it's wrong because although the slope is 1/2, Jennifer used the slope 2/4 while Marshall used 1/2. Even though it's the same, Jennifer didn't technically use 1/2...
And the third option is wrong. The slope isn't 2.
Hopefully this wasn't confusing... :)