GMAT Sentence Correction
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Source: OG
Level: 5
In 1995 Richard Stallman, a well-known critic of the patent system, testified in Patent Office hearings that, to test the system, a colleague of his had managed to win a patent for one of Kirchhoff's laws, an observation about electric current first made in 1845 and now included in virtually every textbook of elementary physics.
- A laws, an observation about electric current first made in 1845 and
- B laws, which was an observation about electric current first made in 1845 and it is
- C laws, namely, it was an observation about electric current first made in 1845 and
- D laws, an observation about electric current first made in 1845, it is
- E laws that was an observation about electric current, first made in 1845, and is