Standard Paragraph Length

After a long day, a teacher is grading a large number of essays which were written by his students. He is reviewing how his students structured their essays. Tom structured his essay so each paragraph had 3 sentences. Jane used 4 to 5 sentences, Katie used 6 to 7 sentences, while Phil used 9 to 10 sentences for each paragraph. Based on this fact alone, which of the following likely received the highest grade?