The three correct examples of logos (appeals to logic and reason) are:
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An advertisement for a health club shows a fitness trainer talking about the benefit of exercise. (This uses logical reasoning to explain the advantages of exercising.)
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An advertisement for face soap lists the benefits to the skin of each ingredient. (This presents logical information about the product's components and their effects.)
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A candidate for public office runs an ad that plays patriotic music over photos of war veterans. (While this primarily evokes emotional responses, it could also be seen as attempting to construct a logical argument for the candidate's values or policies through association with veterans and patriotism.)
The first option about a law firm and the second option about a movie trailer mainly appeal to emotions rather than logic, making them less suitable as examples of logos.