When There Is an Increase in Temperature of a System

When there is an increase in temperature of a system the rate of reaction often increases. Which of the following best explains why this happens?
1. The concentrations increase with temperature.
2. The number of collisions with the sufficient kinetic energy increase with temperature.
3. The number of collisions per unit time increases with temperature.
4. The orientation of the molecules change with temperature.

A) 3 and 4
B) 1 and 3
C) 1 and 2
D) 2 and 4
E) 2 and 3