Which of the following statements is true if HI is formed in the following reaction?

Question

H2(g) + I2(g) → 2HI(g)

a. There are no collisions between the reactants in the reaction
b. All of the collisions between reactants have enough energy to overcome the activation energy.
c. Some of the collisions between reactants have enough energy to overcome the reaction mechanism.
d. Some of the collisions of the reactants have enough energy to overcome the activation energy.