What caused Greek city states to be isolated A. rivers
B. deserts
C. rugged mountains
D. continents

C

Explanation:

From early times the Greeks lived in independent communities isolated from one another by the landscape. Later these communities were organized into poleis or city-states. The mountains prevented large-scale farming and impelled the Greeks to look beyond their borders to new lands where fertile soil was more abundant.

c is the answer for this

answer; clelia mosher;