The following sentences are given. Identify the sentence(s) that contain grammatical error(s). If all sentences are correct, choose "All are correct" as your answer.
(A) The team collaborated seamlessly to develop a comprehensive strategy for the upcoming project.
(B) In today's fast-paced world, effective time management is crucial for maintaining a healthy work-life balance.
(C) Several factors, including climate, geography, and culture, play a significant role in shaping a region's identity.
(D) The collection of rare stamps, along with a few vintage coins, were displayed in a glass case.

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**Solution:**

1. Sentence (A) is grammatically correct. The subject "The team" is singular and the verb "collaborated" agrees with it in past tense.

2. Sentence (B) is also correct. The sentence structure and verb usage are appropriate.

3. Sentence (C) is correct. The plural subject "Several factors" matches the plural verb "play".

4. Sentence (D) contains a grammatical error. The subject "The collection" is singular, so the verb should be singular as well. The correct verb form is "was displayed" instead of "were displayed".

**Answer:** Only (D)

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