سوال ۸۶ کنکور ارشد مدیریت کسب‌وکار (MBA) ۱۴۰۲

Passage summary: The passage introduces desalination as a response to freshwater shortages caused by excess demand, vulnerable supplies and climate change. It explains how reverse osmosis, the most widely used desalination method, treats seawater. The account follows filtration, pressurization, membrane separation and final conditioning, with about half the input becoming usable water. The treated water is then stored for distribution.

Which of the following is the main rhetorical function of paragraph 2?