<u>Answer:</u>
<em>It is important to read good books </em><u><em>that have good plots. (A)</em></u>
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<u>Explanation:</u>
The blank in the sentence is thus filled aptly by ‘that have good plots’. This is because it is grammatically correct and acceptable. A book is an object and thus the word the adjective ‘that’ goes with it. "That" is used for referring an object, person or an idea. It involves something which is already known of like books with good plots are known to people.
The intended audience influences the tone a lot. For an example, what tone would you use for a children’s book/ A book reading to kids? You would use a playful, or funny tone to keep the children entertained. You wouldn’t likely use a strong, professional tone with them. If you was talking to group of college kids, or writing a college text books, what tone would you use? You would most likely use a professional, and serious tone since they are in college. Another little example, what tone do you usually talk to your pet in? Even though they don’t understand us, we usually talk to our furry little friends in a high-pitched voice. Why? Maybe Because we know that they have tiny minds.
Theme is the correct answer