If radius of earth is reduced to half without changing its mass, then match the following columns and choose the correct option from the codes given below.
| Column I | Column II |
| A. Angular momentum of earth | p. Will become one fourth |
| B. Time period of rotation of earth | q. Will become four times |
| C. Rotational kinetic energy of earth | r. No change |
Options:
(a) A-p B-q C-r
(b) A-p B-q C-p
(c) A-r B-p C-q
(d) A-p B-r C-p