In the following sentences, choose and mark the sentence which contains a grammatical or contextual error. If all sentences are correct, mark the “all are correct” option as the answer.

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**Solution:**

1. Analyze each sentence for grammatical and contextual correctness.

2. Sentence (a): "Before we left for the vacation, we had already booked our hotel and made all the necessary arrangements."
   - Correct use of past perfect tense "had already booked" before past action "left".
   - No grammatical or contextual error.

3. Sentence (b): "Despite facing numerous challenges, she remained tenacious in her pursuit of success."
   - Correct use of participle phrase and adjective "tenacious".
   - No error.

4. Sentence (c): "The research findings was disparate, leading to conflicting interpretations among the scientific community."
   - Subject "research findings" is plural.
   - Verb "was" is singular and does not agree with plural subject.
   - Correct verb should be "were".
   - Hence, this sentence contains a grammatical error.

5. Sentence (d): "Once he had received the information, he immediately began working on the project."
   - Correct use of past perfect "had received" and simple past "began".
   - No error.

6. Sentence (e): "All are correct"
   - Since sentence (c) contains an error, this option is incorrect.

**Answer:** (c) The research findings was disparate, leading to conflicting interpretations among the scientific community.

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