Study the following graph related concept of activation energy in a chemical reaction and identify A, B, C and D.

A is activation energy without enzyme, B is activation energy with enzyme, C is Transition state of substrate without enzyme and D is transition state of the substrate in the presence of enzyme.  

B is activation energy without enzyme, A is activation energy with enzyme, C Transition state of substrate without enzyme and D transition state of the substrate in the presence of enzyme.

B is activation energy without enzyme, A is activation energy with enzyme, D is Transition state of substrate without enzyme and C is transition state of the substrate in the presence of enzyme.   

C is activation energy without enzyme, B is activation energy with enzyme, A is Transition state of substrate without enzyme and D is transition state of the substrate in the presence of enzyme.