If P(9a – 2, –b) divides line segment joining the points A(3a + 1, –3) and B(8a, 5) in the ratio 3 ∶ 1, then the values of a and b are -

• A. a = 1, b = 3
• B. a = -1, b = 3
• C. a = -1, b = -3
• D. a = 1, b = -3