The right answer here would be A - the phrase 'modulate your voice'
refers to a need to vary your voice's properties. Modulating means
changing the pitch or tone, and can be used referring to one's voice, or
to an instrument. You can modulate both up or down, and this usually
involves changing the key signature in which you are playing or singing.
A. If Henry goes to the library, the world is a better place.
Answer: The appeal made in this sentence is a logical appeal.
Explanation:
A logical appeal is a persuasive technique which is based on evidence. In this sentence, the statement made was based on a study published in the Wall Street Journal. The results of this study, therefore, represent evidence. According to Aristotle, apart from logical appeals, there are two other methods of persuasion - emotional appeals and ethical appeals.