The displacement of a particle is proportional to the cube of time elapsed. How does the acceleration of the particle depends on time obtained [Pb. PET 2001]

• A.                         \[a\propto {{t}^{2}}\]                      
• B.                         \[a\propto 2t\]            
• C.                         \[a\propto {{t}^{3}}\]                      
• D.                                  \[a\propto t\]