In the energy diagram for a biological reaction given below, identify the correct labeling for A, B, and C.

• A. A - Transition state, B - Activation energy in the absence of an enzyme, C - Activation energy in the presence of an enzyme.
• B. A - Transition state, B - Activation energy in the presence of an enzyme, C - Activation energy in the absence of an enzyme.
• C. A - Activation state, B - Activation energy in the absence of an enzyme, C - Activation energy in the presence of an enzyme.
• D. A - Activation state, B - Activation energy in the presence of an enzyme, C - Activation energy in the absence of an enzyme.