Question:

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.
Which of the following is the correct version of the sentence?

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When constructing explanations, keep the sentence clear and avoid unnecessary words or clauses.
Updated On: Oct 1, 2025
  • laws, an observation about electric current first made in 1845
  • laws, which was an observation about electric current first made in 1845 and it is
  • laws, namely, it was an observation about electric current first made in 1845 and
  • laws, an observation about electric current first made in 1845 and
  • laws, an observation about electric current first made in 1845, it is
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The Correct Option is D

Solution and Explanation

Step 1: Understanding the sentence structure.
The sentence should maintain clarity, using the phrase “laws, an observation about electric current” as a non-restrictive clause to further explain the laws.
Step 2: Analyzing the options.
- (A) This option is grammatically correct but lacks clarity due to the conjunction “and” not clearly linking the explanation.
- (B) The phrase "it is" is redundant and incorrect.
- (C) This introduces unnecessary complexity with "namely," which does not improve the sentence.
- (D) This is the correct answer, as it provides clear and concise information.
- (E) This option has unnecessary complexity with "it is."
Step 3: Conclusion.
The correct answer is (D), as it maintains clarity and conciseness.
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