Which will cause an increase in the reaction rate between molecules? molecules have strong internal bonding. molecules collide more frequently. electrons in the bonds remain in a meta-stable state. electrons do not have enough energy to leave the bonds.

           Molecules Collide more frequently

The factors which effect the rate of reactions are as follow,

                  Concentration:

                                           Increase in concentration of reactants will increase the number of reactants per unit volume. Therefore, the probability of collisions will increase hence, it will result in the increase in yield.

                  Temperature:

                                       Increase in temperature increases the kinetic energy of reactants. Therefore, the increase in velocity of reactants results in the collisions with high energy. It makes it feasible for reactants to attain the optimum energy (activation energy) to convert into products with good yield.

                 Surface Area:

                                      The reactants in grinded / powder form reacts fast as compared to solid form. In fact, grinding results in increase of the surface area of reactants. Greater surface area increases the probability of reactants to colloid. Hence, increases the yield.

                   As shown, all the given factors are related to collisions of molecules or atoms hence, the option selected is the correct option.

h let me think

i believe the answer is a.