What Is the Purpose of Grinding Yard Waste Before Putting

What is the purpose of grinding yard waste before putting it into composting piles?

A) Bacteria are microscopic organisms and can only break down very small pieces of matter, which grinding produces.
B) Grinding the material breaks down some of the components that microbes cannot digest, such as cellulose.
C) Grinding the matter introduces large amounts of oxygen into the material, which is essential for microbial degradation of matter.
D) Grinding yard waste is a method for introducing degradative microbes into the mix, needed for composting.
E) Grinding the material increases the surface area available for microbial action, so that the material can be degraded more efficiently.