This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to find worms
Wait for a rainy fall day.
You can find worms at any time, but it will be easiest when it's just rained. The water drives the worms out of the ground into the open air.

Available choices: a. The humidity lowers the temperature to 90 degrees fahrenheit (7 degrees celsius) and the slushy innards humidify immediately. At the same time, the hydroponic system performs a better job of killing slugs than any other system.. b. You can try this method at home or you can get a box of worms at a local pharmacy or convenience store. Light caring is believed to help this process along, since worms tend to grow during the day.. c. Use a pesticide bottle to spray the worms about a yard. This tactic will help repel the worms when it's raining, plus it will keep the worms in the ground longer.. d. They'll head for dry land: sidewalks, roads, driveways, and patios. Look for worms on a humid day before it rains, or during a rain-shower..
The answer is:
d.