SPOT THE ERROR
Correct answer: C. In the course of these experiments Pasteur found that some germs were very difficult to destroy by heat.
- A. In the course of these experiment Pasteur found that some germs are very difficult to destroy by heat.
- B. In the course of these experiments Pasteur found that some germ is very difficult to destroy by heat.
- C. In the course of these experiments Pasteur found that some germs were very difficult to destroy by heat.
- D. In the course of these experiments Pasteur found that some germs are very difficult to destroy by heat.
Explanation
Option C uses the past tense "were" to match the past tense of "found" and is grammatically accurate. The other options have issues with subject-verb agreement or verb tense.
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