Study the following statements about the interior of the earth and select the correct answer from the codes given below: (1) The average density of the outer crust is 2.8. (2) The crust is separated from the mantle by the Gutenberg discontinuity. (3) There is sudden increase in the velocity of P waves along the mantle core boundary. (4) The inner core of the earth is in molten state.

• A. 1 and 2
• B. 2 and 3
• C. 1 and 3
• D. 3 and 4