<span>A. replacing private ownership with common ownership
</span>After World War II, Mao Zedong believed that improvements in farm production could be achieved only by replacing private ownership with common ownership.
NOT:
<span>B. conquering the island of Taiwan
C. replacing common ownership with private ownership
D. sharing power with the Nationalist party</span>
I would say that in very fast moving water such as in a river, the cobble size could be transported because cobbles are 64-256mm so are quite big and in a quiescent stream won't move much but in a freshet say in a steep mountain stream they can be rolled along such as I observed in the local streams at a mining town during the Hurricane Fifi in Honduras in 1974.
It's Saudi Arabia.
Hope this helps!
