For any time t≥ 0 , if the position of a particle in the xy -plane is given by x=t²+1 and y=ln (2t+3) , then the acceleration vector is
A (2t,2/(2t+3))
B (2t,-4/(2t+3)²)
C (2,4/(2t+3)²)
D (2,2/(2t+3)²)
E (2,-4/(2t+3)²)