Which of these underlined adjectives is in the positive form?
A. The cheetah is the fastest (underlined) land animal, with a record speed of 60–75 miles per hour.
B. Harriet did a good (underlined) job repairing the sink, thus saving her family quite a lot of money.
C. Luke is much taller (underlined) than his brother Richard, although Luke is three years younger.
D. This restaurant is the best (underlined) in town, celebrated for its juicy fried chicken and salads.