I guess the answer is surface P
Am I right???

Dear student,
The friction is greatest at P as it requires maximum force to move. A body starts moving only when its static friction is overcome, 
The property by virtue of which a resisting force is created between two rough bodies that resists the sliding of one body over the other is known as friction.
The maximum frictional force present when a body just tends to slide over the surface of another body is known as the static friction

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