With regards to ancient history, the areas on this map marked with an "x" all have what in common?
a) none were able to trade over great distances.
b) none lasted out of the ancient era of history.
c) all were protected from invasion by geographic features.
d) all had civilizations that were centered along major rivers.

Which statement best describes the response by the united states and its allies to the berlin blockade? planes dropped tons of supplies around the city each day. trucks smuggled tons of supplies into berlin about once a week. tons of supplies were delivered to west berlin by boats. tons of supplies were purchased from east berlin each day.