Which of the following sentences from the article supports the main idea that it is important to know what to do in case of a severe storm? a. "if tornadoes affect your area, you need to have supplies and a plan to ensure your safety." b. "some people hear the tornado siren screaming and think of the other times it sounded without any serious danger." c. "naturally, after a few 'false' alarms, they just begin ignoring the siren altogether." d. "sure, most of the time the worst of the severe weather will affect someone else."