Which of the Following People Provides the Most Accurate Information

Which of the following people provides the most accurate information on the revision phase of writing?

A) Satyajit: "Students usually spend very little time in revising a paper they have written."
B) Yasujiro: "Students typically underestimate the amount of time they spend in revising their papers."
C) Margarethe: "When students are asked to revise sentences written by another person, they typically focus on the organizational problems."
D) Luís: "Students are remarkably accurate when identifying the specific grammatical errors in an essay."