Item — sat-dog

Medium Reading and Writing · Standard English Conventions · None · MCQ

Although a few people have claimed to be the inventor of the modern bicycle, it was Kirkpatrick Macmillan who actually invented the velocipede, a forerunner of the modern bicycle. Macmillan, a Scottish blacksmith, built his velocipede in 1839, using wooden wheels. The velocipede was powered by the rider's feet and could only travel in a straight line. It was a very basic machine. However, it was a crucial step in the development of the modern bicycle, which was invented several years later.

Which choice most effectively combines the sentences at the underlined portion without changing the meaning?

A
However, it was a crucial step in the development of the modern bicycle.
B
However, it was a very basic machine, a crucial step in the development of the modern bicycle.
C
However, it was a very basic machine, which was a crucial step in the development of the modern bicycle.
D
However, it was a very basic machine, but it was a crucial step in the development of the modern bicycle.

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