More U.S. soldiers died in the Civil War than in any other war where the statement describes a fact rather than an opinion. Thus, the option (a) is correct.
What is opinion?
The term opinion refers to someone's own point of view. The term “opinion” refers to the clarification, judgment, and explanation given to another person, group, or object. For example, political parties and sports-related people share opinions.
The first sentence is based on fact, as more U.S. soldiers died in the Civil War than not opinion-based. The more soldiers died is a fact-based historical event that is included.
Therefore, option (a) is correct.
Learn more about on opinion, here:
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