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Operation of helical gears is silent and quiet while the operation of the spur gears is noisy because

[A].	helical gears have some helix angle but the spur gears are straight	[B].	there is end thrust in helical gears
[C].	in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate	[D].	none of the above

Answer: Option C