According to the Collision Theory in Gaseous Molecules, Collision Frequency

According to the collision theory in gaseous molecules, collision frequency is ________ and reaction is ________ because ________.

A) low, low, molecules are so far apart
B) high, high, each collision results in a reaction
C) low, low, molecules must collide before they can react
D) high, relatively low, only a fraction of the collisions lead to a reaction
E) low, high, molecules are moving so fast that each reaction causes many others