Which bus type is classified as the smallest: suburban or van conversion?

The classification of bus types helps in understanding their size and intended use. Type A buses are recognized as the smallest category within the standard classification system. Specifically, they are built on a van chassis and have a gross vehicle weight rating (GVWR) of up to 10,000 pounds. This makes them suitable for smaller passenger loads, typically transporting 10-30 passengers.

In contrast, Type B, Type C, and Type D buses are larger. Type B buses are built on a truck chassis and are generally used for larger groups than Type A. Type C buses are often known as 'transit buses' and designed primarily for school transportation, capable of seating more passengers. Type D buses are the largest, typically built on a front-engine chassis and designed for maximum capacity and larger groups.

Therefore, in the comparison of bus types, Type A stands out as the smallest bus type, making it the correct choice for this question.