<span>This apparent measurement difference is due to a change in position of the observer, and is called "Parallax"
In short, Your Answer would be Option C
Hope this helps!</span>
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Answer:
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The initial kinetic energy of the boat and its rider is

After Sam stops it, the final kinetic energy of the boat+rider is

because its final velocity is zero.
For the law of conservation of energy, the work done by Sam is the variation of kinetic energy of the system:

where the negative sign is due to the fact that the force Sam is applying goes against the direction of motion of the boat.