Source: Barron GMAT CD
Archaeological excavations of Roman ruins on the Greek island of Crete show that securing control over the maritime trade routes of the Eastern Mediterranean was a primary goal of the Romans, as it was of the Greeks in preceding centuries.
A. as it was of the Greeks
B. like that of the Greeks
C. as that of the Greeks
D. just as the Greeks did
E. as did the Greeks
Can some explain that how to arrive at answer?