Read the following text from a student essay. How can the writer best improve his or her grammar and mechanics?
Imre Nagy became the leader of Hungary in, 1953. Nagy opposed the Soviet Union's influence on his country. As a result, he was forced out of office in, 1955. Hungarian protesters in the city of, Budapest, demonstrated against the Soviets in support of Nagy. A period of revolt, and unrest followed. In November, 1956, thousands of Soviet troops, and tanks stormed into Hungary. Thousands of Hungarians fled, or were killed. Nagy was captured, and executed.

A by removing unnecessary commas
B by using correct verb tenses