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pogo sticks

your great-grandmother may have used a pogo stick as a young girl, because these toys have been around for a long time. they were invented by george b. hansburg in germany in 1919, and originally were made of wood. when an american company ordered the first large shipment of the new toy in 1919, however, the wooden pogo sticks warped during the long, humid trip across the ocean, which made them unsellable. the inventor, mr. hansburg, then developed a steel version with an enclosed spring, which he began producing himself at a factory in elmhurst, new york.

which sentence would be the best concluding statement for this paragraph?

a)
the pogo stick quickly became wildly popular in the united states.

b)
that factory is still the leading producer of steel pogo sticks in the world.

c)
the pogo stick has never stopped being made and sales have remained relatively steady.

d)
as recently as 2001, an american company came out with an air-powered pogo stick made from aircraft- grade aluminum.