please help me and fast please!!!!

Answer:
b I think
Step-by-step explanation:
it would need to be a positive line so that eliminated A. also D is not it because the calories will go up, and not stay the same. this leaves is with B and C. I think that it is B because you have to start at 0. hope this helped!
Answer:
B
Step-by-step explanation:
You burn more calories as you exercise, so A and D are wrong. You don't burn any calories if you don't exercise, so C is wrong.
Therefore, B is the correct answer.
Hope I helped!!!