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Spiders

(1) Running across a spider in your house can be alarming, but before you do it any harm, consider this. (2) Spiders actually have a number of benefits. (3) The one most people are familiar with is that spiders eat pesky insects, like mosquitoes. (4) This means you will not need to buy insect repellent or to take other measures to rid your home of pests. (5) Spiders will do this work for you, and they don't cost a thing! (6) The next time you're tempted to stomp on one, or usher it out your door, remember that the spider is actually helping you clean house!

Choose the best place to add the following sentence.

They even eat flies and other small insects!
A.
after sentence 3
B.
after sentence 6
C.
before sentence 2
D.
before sentence 1