Which sentence uses syntax for emphasis?

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

It is easier to do a job right than to explain why you didn't.-Martin Van Buren

The price of freedom is eternal vigilance ... Thomas Jefferson

The brave men, living and dead, who struggled here, have consecrated it ... Abraham Lincoln

One of the following sentences that uses syntax for emphasis would include: It is easier to do a job right than to explain why you didn't. - Martin Van Buren.

Syntax refers to the words order and the structure of a sentence, so the "to do a job right" and the "than to explain why you didn't" part emphasizes to the reader the "to do a job right" part.

second option would be the answer