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

The sentence that uses syntax for emphasis is, "Ask not what your country can do for you... John F. Kennedy. In emphasizing ideas when writing, the writer achieves his/goal by making the article or speech more powerful and convincing by using syntax. Syntax is how the words, punctuations and phrases are correctly arranged in the sentence.