According to collision theory, the rate of reaction depends on atoms colliding in the correct with enough for the reaction to occur. Increasing the of collision increases the likelihood of the reaction occurring.

orientation , energy , frequency

Explanation:

According to the collision theory , the number of collisions that take place per unit volume of the reaction mixture is called collision frequency. The effective collisions are ones which result into the formation of products.

Effective collisions depends on the following  two factors:-

1. Orientation factor: The colliding molecules must have proper orientation at the time of collision to result into formation of products.

2. Energy factor:  For collision to be effective,  the colliding molecules must have energy more than a particular value called as threshold energy.

i'm assuming that the correct answer is indeed the first one/ "a"..

can you attach the