The displacement of a particle undergoing rectilinear motion along the 𝑥-axis is given by 𝑥 = (2𝑡2 + 21𝑡 2 + 60𝑡 + 6). The acceleration of the particle when its velocity is zero is

Question : The displacement of a particle undergoing rectilinear motion along the 𝑥-axis is given by 𝑥 = (2𝑡2 + 21𝑡 2 + 60𝑡 + 6). The acceleration of the particle when its velocity is zero is

(A) $36ms^{-2}$

(B) $9ms^{-2}$

(C) $-9ms^{-2}$

(D) $-18ms^{-2}$