Question

look at these details from a paragraph about the same topic: before a tornado, the sky may turn very dark and sometimes green. when a tornado is near, you may hear a loud roaring sound that lasts a long time. there can be hail or very heavy rain before a tornado strikes. choose the main, or central, idea that ties all the details together. there are some signs that show a tornado is coming. there are a few ways to stay safe during a tornado. as a tornado approaches, you may see a large cloud of dust.

Explanation:

The details list phenomena like sky - color change, sound, and weather conditions before a tornado. These are signs of an approaching tornado. The option about safety ways is not related to the given details. The option about seeing a large cloud of dust is just one possible sign and not comprehensive.

Answer:

There are some signs that show a tornado is coming.