Of the events listed, which played the biggest role in the presidential election of 1968?
a. the sitting president was assassinated.
b. a presidential candidate was assassinated.
c. the united states pulled all troops out of vietnamd)the president was under congressional investigation.

The correct answer to the following question will be Option B (A Presidential candidate was assassinated).

Explanation:

The presidential election of the United States in 1968 was the 46th quadrennial. On Tuesday 5 November 1968. This took place. The former vice-president of the Republic, Mr. Richard Nixon, defeated the new vice-president of democracy, Mr. Hubert Humphrey.In the 1968 Democratic National Convention which witnessed numerous anti-war protests, Humphrey won the presidential nomination.The popular vote won by Nixon was less than one, although the majority of the States won the election outside of the North-East comfortably. Former Governor George Wallace of Alabama, the American Independent Party, won the Deep South elections with 13.5% of the popular vote.