Which of the following best describes the general philosophical mood of those writers of the seventeenth century interested in social progress?
a. optimisticb. militaristicc. alarmedd. unfocused

"optimistic"

Explanation:

According to my research on different philosophers during the seventeenth century, It is said that those interested in social progress were considered as "optimistic". During this century there were many diseases (bubonic plague) and Civil Wars going on that social progress was more of an abstract idea.

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major league baseball

explanation:

jack roosevelt robinson broke the color barrier in major league baseball.as he was the first african american to play in the major leagues, jackie robinson became the target of racial abuse. jackie robinson is referring to the historic event, harlem riot.