The correct answer is A. Begin sentences with different parts of speech.
Step-by-step explanation:
In texts, varying sentences means including different types of sentences to avoid monotony and express ideas in the best way. In the case of the text presented, the author has not used sentence variety effectively as from sentence 4 to 9 the sentences begin in the same way using "iced desserts" or "ice cream" multiple times and then the past verb "were" to create mainly passive sentences, this creates monotony and breaks the flow of ideas. Because of this, in this case, the best way to vary the sentences is to "Begin sentences with different parts of speech", because the main issue, in this case, is that the same words are used to begin all sentences.