It is easier to roll a barrel full of coal tar than to pull it because

[A].	the full weight of the barrel comes into play when it is pulled
[B].	the rolling friction is much less than the sliding friction
[C].	more surface area of the barrel is in contact with the road when it is pulled
[D].	coal tar is a liquid and it flows in the barrel when it is rolled

Answer: Option B

Explanation:

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