Answer:
After
It's the choice that makes the most sense with the sentence.
I already used this for a test so you might want to rephrase it:
<span>Scientists have often wondered what bellybutton lint is made up of. An Austrain chemist named Georg Steinhauser decided to find out, and since he had a belly button, he searched himself! He examined over 500 pieces to see what the lint has occupied. He found that it has cotton from clothes, AND dead skin, sweat, basically the stuff our body resists and extracts. Goerg Steinhauser found all this out within a teeny tiny part of your stomach.
</span>
Hope this helps!
C. Look at how each word is in the same tense and in complete sentences.
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