Answer:
I think the answer is D (compound)
Combine sentences 2, 3, and 4 to create a series.
The question asks about revisions to create more sentence length variety. There are already many short sentences so we want to choose an answer that would create a long sentence. Combining sentences 2, 3, and 4 would reduce the number of short sentences and create one long sentence but keeping clarity.
Introduction or thesis statement
The first sentence is what the paragraph is going to be about, her favorite breed of dog
Answer: Please show the page