Why is it easier to fetch water from a well using a pulley?

Because rolling friction is lesser than sliding friction

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Weight of bucket increases while pulling up

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While pulling up the bucket feels a pseudo acceleration in the downward direction which increases the total weight.

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While pulling up you are pulling bucket's weight and your hand's against gravity while using pulley you are effectively pulling only the weight of the bucket - the weight of your hand.

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Solution

The correct option is D
While pulling up you are pulling bucket's weight and your hand's against gravity while using pulley you are effectively pulling only the weight of the bucket - the weight of your hand.

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