Answer it yourself. Nobody knows what "Baldwin's essay" is about. Can't expect answers without full context.
The topic sentence that must be added to the given body paragraph would be:
B). Recent studies prove that popcorn is one of the healthiest snack choices.
<h3>What is Topic Sentence?</h3>
"Topic sentence" is described as the sentence that functions to convey the major idea of the para in a condensed form.
In the given paragraph, the sentence 'Recent studies...choices' would most adequately function as the topic sentence.
The reason behind this is that it offers a summary of the key idea provided in the paragraph that the latest studies display popcorn as a healthy snack.
Thus, option B is the correct answer.
Learn more about "Topic" here:
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The underlined phrase in the sentence "passing the window" is used as, option D. Participial Phrase. A participial phrase consists of a word ending in -ing or -en plus its modifiers. Participial phrases often function as adjectives. The underlined phrase "passing the window" describes the noun "people".
