The graph shows how the displacement $d$ of an object varies with time $t$. The tangent to the curve at time ${t_1}$ is also shown.

Which of the following gives the speed of the object at point P?

A.     the gradient at P

B.     the shaded area

C.     $\frac{1}{{{\text{gradient at P}}}}$

D.     $\frac{{{d_1}}}{{{t_1}}}$

A