Identify the incorrect sentence from the options given below.

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Accepted Answer

**Solution:**

1. Sentence (a) is correct because the subject "The principal" is singular, and the phrase "along with the teachers" does not change the singular verb "is".

2. Sentence (b) is correct. The subjunctive mood is used correctly in "that the patient take complete rest".

3. Sentence (c) is incorrect. The correct form for the third conditional sentence is: "If the company had implemented better strategies, it could have achieved higher growth." The phrase "would have" should not be used in the 'if' clause.

4. Sentence (d) is correct. The relative clause "which contains detailed illustrations and explanations" is properly used.

**Answer:** (c)

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