The primary difference between a common interest subdivision and a standard subdivision is

A common interest subdivision typically involves shared ownership of common areas such as parks, pools, and roads, while a standard subdivision involves individual ownership of each property. This shared ownership aspect is what sets a common interest subdivision apart from a standard one. Options A, B, and D may all be factors that differ between different subdivisions, but they do not directly distinguish between a common interest subdivision and a standard one. For example, properties in a common interest subdivision may vary in size, but the shared ownership of common areas is still the defining factor.