Part A:
The correct answer is D. The author's purpose is to inform which is why he or she did not include any personal opinions.
Part B:
The sentence that supports this answer is B. "The three palm islands consist of the Palm Jumeirah, Palm Jebel Ali, and Palm Deira, which are being built on the coast of the United Arab Emirates, in Dubai." This sentence provides factual information about the construction of the islands and does not contain any personal opinions.