A sailing ship built and rigged for speed especially a type of three-masted ship with a fast hull form and a lofty rig, built in the U. S. From about 1845-1870 and used in trades in which speed was more important than cargo capacity

The type of ship referred to here is called a Clipper Ship.

Explanation:

Clipper ships were built for strength and speed. Strenght in term of their ability to carry cargo, defend themselves when confronted with pirates and or outrun enemy ships or the English ships which often patrolled the Atlantic.

Of course, any ship which had a need to outrun the British Patrols was most likely involved in illegal trades such as slave trade.

For those who were into legitimate trades such as the shipping and transportation of tea, precious metal and other international commodities became very rich as their time of delivery was reduced drastically in that time.

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the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

the answer is b. hope this !