Answer
$v_{c}\lt v_{a}=v_{b}=v_{d}=v_{f}\lt v_{e}$
Work Step by Step
Remember that, in a position-versus-time plot of an object, the slope of tangent line is equal to the instantaneous velocity of the object.
The slope of the tangent lines at points A, B, D and F is zero (horizontal).
The slope of the tangent line at the point C is negative. The tangent line points down.
The slope of the tangent line at the point E is positive. The tangent line points up.
