For an elementary dimerization reaction of the type $$2\text{R} \rightarrow \text{R}_2$$, the value of the steric factor was found to be 2.5. This indicates that

A

the experimentally obtained rate is 2.5 times faster than the theoretical rate

B

ratio of the number of collisions calculated from collision theory and that actually take place is $$1 \colon 2.5$$

C

the activation energy of the reaction is the same for both the experimental and calculated values

D

the molecules of reactant R may be of some complex structure