President lyndon b. johnson a. decided not to run in the 1964 election. b. won the 1964 election by a narrow margin. c. won the 1964 election by a wide margin. d. lost the 1964 election by a narrow margin. correct answer is: c. won the 1964 election by a wide margin

"In the 1960 campaign, Lyndon B. Johnson was elected Vice President as John F. Kennedy’s running mate. On November 22, 1963, when Kennedy was assassinated, Johnson was sworn in as the 36th United States President, with a vision to build “A Great Society” for the American people... In 1964, Johnson won the Presidency with 61 percent of the vote and had the widest popular margin in American history–more than 15,000,000 votes"(https://www.whitehouse.gov/about-the-white-house/presidents/lyndon-b-johnson/).

So yes, the correct answer is C.