SAT English Practice Question

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.

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