Read the original passage before answering. Paragraph 1 (1) A campus residence practices a storm-shelter procedure several times. (2) The residence director wants the instructions to describe the repeated sequence. Paragraph 2 (3) The warning siren sounded. (4) Occupants moved to the interior shelter area. (5) Staff checked every room during each drill. Which option combines the two sentences without changing the fact that occupants moved to shelter each time the siren sounded?