Read the following everyday actions and identify in which case the stated force does negative work on the object:
A. A person lifts a school bag vertically upward (force considered: upward pull by the hand).
B. A cricket fielder stops a fast-moving ball with his hands (force considered: force exerted by the hands on the ball).
C. A donkey carries a load while walking horizontally (force considered: gravitational force on the load).
D. A book kept on a table (force considered: normal reaction from the table).
Which case involves negative work by the mentioned force?
a) C
b) B
c) A
d) D