The correct answer is option B.
It determines how difficult it is to start the reaction.
Activation energy is defined as the minimum energy or the threshold energy required for the reactants to get converted to products. Thus it is the minimum energy required to start a chemical reaction. A higher activation energy means it is much more difficult to start a chemical reaction whereas a lower activation energy means it is much easier to start a chemical reaction.
The correct answer is
B - It determines how difficult it is to start the reaction
:)
