On the curve, the points at which the gradient of the curve is equal to zero are
Attached Figure / Diagram
A
c, d, f. i, l
B
b, e, g, j, m
C
a, b, c, d, f, i, j, l
D
c, d, f, h, i, l
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
The gradient of any curve is equal to zero at the turning points. i.e. maximum or minimum points. The points in the above curve are b, e, g, j, m
Source: Myschool Past Questions Archive (Record #32894)