In a Heat Exchanger with Steam Outside the Tubes, a Liquid

In a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be

A) Less than 45°C
B) More than 45°C
C) Equal to 45°C
D) Initially decreases and remains constant thereafter