Correct Answer: B

Rationale: The correct answer is B, 'On the 5:30 train.' This is a sentence fragment because it does not contain a subject and a verb. In this case, 'On the 5:30 train' is a prepositional phrase, not a complete sentence. Choices A, C, and D are complete sentences as they have both a subject and a verb, making them grammatically correct and not sentence fragments.

Correct Answer: D

Rationale: The correct answer is D because it introduces the historical origin of yoga, which is the main focus of the paragraph. This sentence sets the context by providing a foundational understanding of where and when yoga originated. Choice A talks about the mention of yoga in the Vedas but does not provide information about the historical development of yoga itself. Choice B discusses the travel of yoga masters to the West, which is a later development in the history of yoga and not the starting point. Choice C refers to a shift in yoga philosophy without directly addressing its origins, making it less suitable as a topic sentence compared to choice D.

Correct Answer: B

Rationale: The correct answer is B, 'On the 5:30 train.' This is a sentence fragment because it does not contain a subject and a verb. In this case, 'On the 5:30 train' is a prepositional phrase, not a complete sentence. Choices A, C, and D are complete sentences as they have both a subject and a verb, making them grammatically correct and not sentence fragments.

Correct Answer: A

Rationale: Choice A is the correct answer as it directly addresses the writing prompt by focusing on a specific threat faced by a national park in the United States, which is the rising sea level affecting Florida's Everglades National Park. This choice provides a clear thesis statement for a research report on the topic. Choices B, C, and D are incorrect. Choice B provides general information about the Grand Canyon but does not discuss any threats it is facing. Choice C is not relevant to the prompt as it talks about accidents on a specific highway within Glacier National Park rather than broader threats to the park itself. Choice D is about a personal experience at Acadia National Park and does not address any threats the park may be experiencing.

Correct Answer: A

Rationale: The correct answer is 'Children's.' In this context, 'Children's' is the correct possessive form to indicate that the books belong to or are associated with children. Choice B ('Childrens's') is incorrect due to the unnecessary extra 's' after the apostrophe. Choice C ('Childrens'') is wrong as it is missing the apostrophe to show possession. Choice D ('Childrens') is incorrect as it is missing the apostrophe and does not form the possessive form correctly.