Take another look at the sentence:

Davina, a good friend from my biology class, has more interest in what is under a guy's skin than what is under his clothes, for this reason, she is pursuing a degree in radiography.

The comma between reason and she is perfectly legal. For this reason is a prepositional phrase that is introducing the main clause that follows: she is pursuing a degree in radiography. When a prepositional phrase acts like an introductory transition, as it does in the sentence above, use a comma after it.

Go back to the sentence to try again.

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