What must happen before a chemical reaction can begin?

a the activation energy must be exceeded.
b the activation energy must be reached.
c the concentrations of products and reactants must be equal.
d the concentration of reactant molecules must be reduced.

B . the activation energy must be reached

This is what i found on google “when one phosphate group is removed by breaking a phosphoanhydride bond in a process called hydrolysis, energy is released, and atp is converted to adenosine diphosphate (adp). likewise, energy is also released when a phosphate is removed from adp to form adenosine monophosphate (amp).” i hope this you .