ykaiim
Of all the countries contiguous to China,
the Soviet Union's borders were most strongly defended. A) the Soviet Union's borders were most strongly defended
B) the borders of the Soviet Union were defended more strongly than any of the others
C) the Soviet Union's borders stood out for the strength of their defensive capability
D) the Soviet Union had the most strongly defended borders
E) the Soviet Union's were the most strongly defended borders
KAPLAN OFFICIAL EXPLANATION:
The introductory phrase, "Of all the countries contiguous to China," is the modifier. Clearly it describes a country contiguous to China that the author wants to comment on further. The country being modified, here the Soviet Union, must be named directly after the modifying phrase in order for the modifier to be used correctly, but in the original sentence we see not the Soviet Union but the Soviet Unions borders. Don't be fooled by the fact that (A) and (C) seem to begin by naming the Soviet Union. The possessive apostrophe makes the phrase the Soviet Union's borders equivalent to the borders of the Soviet Union, making the borders, not the country, the subject of the choices. Since the country, not its borders, should be modified by the original phrase, eliminate (А), (В), (C), and (E). (D) may not sound particularly eloquent, but it is the only grammatically correct, and therefore the only viable, option. (D) wins.