The correct options are
A Molecules of body A becomes less active.
B The heat flow is from body A to body B.
A body at a higher temperature has more active molecules than a body at a lower temperature and also heat flows from a body at higher temperature to a body at lower temperature. Before A and B comes in contact, A has more active molecules. When A and B are brought in contact, heat flows from body A to body B and the temperature of B increases. Hence, the molecules of B will become more active. Also, the temperature of A decreases. Hence, the molecules of A becomes less active.