A stone tied to the end of a string 1𝑚 long is whirled in a horizontal circle with a constant speed. If the stone makes 22 revolution in 44 seconds, what is the magnitude and direction of acceleration of the stone

Question: A stone tied to the end of a string 1𝑚 long is whirled in a horizontal circle with a constant speed. If the stone makes 22 revolution in 44 seconds, what is the magnitude and direction of acceleration of the stone

(A) \begin{aligned}\cdot \ \pi^{2}/4ms^{-2}\end{aligned} and direction along the radius towards the centre

(B) \pi ^{2}ms^{-2}and direction along the radius away from the centre

(C) \pi ^{2}ms^{-2}and direction along the radius towards the centre

(D) \pi ^{2}ms^{-2}and direction along the tangent to the circle