Answer: The slope of function A is constant. The slope of function B is not constant.
Explanation:
The answer choices you have so far are correct, so I will help with the last sentence.
Constant is when the rate of change/slope changes the same each time. So, Function A has constant slope.
Not constant is when the rate of change/slope changes differently each time. Notice that for function B, the change is 1, 3, 5. These numbers aren't the same, so function B has not constant slope.