Take a look at the passage again:
Deidre has to watch her baby constantly, for Mathew likes to crawl around
the floorboards and pop anything into his mouth. Such as fuzz-covered candies,
dog biscuits, and dead bugs.
You chose to connect the afterthought fragment to the main clause before it, like this:
Deidre has to watch her baby constantly, for Mathew likes to crawl around
the floorboards and pop anything into his mouth:
such as, fuzz-covered candies, dog biscuits, and dead bugs.
Unfortunately, you must use less elaborate punctuation to connect these two parts correctly. Review the rules.
Go back to the sentence to try again.