Molecules must collide in order for a chemical reaction to take place. According to collision theory, what other factors are important?

pisgahchemist2014-08-16T05:59:19Z

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In order for a reaction to occur, two particles must collide with a combined energy equal to or greater than the activation energy, and they must collide in the correct orientation for the product to be formed.

Therefore, it is I and II, but not III.

?2014-08-16T04:36:14Z

(A) I and II

(B) I and III

(C) II and III

(D) I, II, and III

NOTE: I know for sure that I and II are factors. I'm just not sure about factor number III. Does anyone know for sure, like 100% sure? Thanks for taking the time to answer :-)