Question

the following text is about the sports term upset, and a famous race between two horses in 1919. select the best detail to show that people thought man o war would win the race.

so why is an unexpected sports result called an upset? we dont know for sure, but some people think its because of a horse race way back in 1919. the greatest racehorse of the time was named man o war, and one day in upstate new york, he was upset by a less successful horse. that horses name? upset... many people think that because of that race, the word upset worked its way into common usage in the english language.

from len berman, the greatest moments in sports. copyright 2012 by sourcebooks

Explanation:

To determine the best detail showing people thought Man o' War would win, we analyze the text. The phrase "the greatest racehorse of the time was named Man o' War" implies people expected him to win, as being the greatest racehorse would lead to the belief he'd win races.

Answer:

The detail is: "the greatest racehorse of the time was named Man o' War"