Read the paragraph. english novelist joseph conrad learned about the ocean through his sailing experiences. working as a sailor, he learned that the sea was both lonely and fascinating. later, as an apprentice in the french merchant service, he sailed to the west indies and then on a voyage to venezuela. at another point in his life, he worked as a deck hand on a freighter that sailed to the eastern mediterranean. the sentence in bold is an extension of the topic sentence. what does it add to the topic sentence? a. it provides a concrete example that supports the topic sentence. b. it poses a thought-provoking question. c. it states the controlling idea. d. it restates and expands on the main point.