Solution:
Choice B is correct.
Clearly, from graph the curve increases from x=40 to x=50 and then it start decreasing from x=50 to x=60.
Hence, option B is correct.
Solution:
Choice B is correct.
Clearly, from graph the curve increases from x=40 to x=50 and then it start decreasing from x=50 to x=60.
Hence, option B is correct.
