Question

Which sentence uses syntax for emphasis?

a. It is easier to do a job right than to explain why you didn't.—Martin Van Buren
b. The price of freedom is eternal vigilance … Thomas Jefferson
c. Ask not what your country can do for you... John F. Kennedy
d. The brave men, living and dead, who struggled here, have consecrated it... Abraham Lincoln

Answer 1

C. Ask not what your country can do for you... John F. Kennedy

Because the nature of the sentence is twisted in the beginning, this provides an interesting syntax structure.