By About 6,000 Years Ago, the Number of Different Token

By about 6,000 years ago, the number of different token forms:

A) declined as cuneiform writing replaced the token system
B) declined from about 100 different forms to only about 10 as hieroglyphic writing replaced them
C) increased from about 100 to 200 as more people learned to make and "read" the tokens
D) exploded from 16 basic forms to about 300