Take a look at the item again:
Karlene drove slowly through the heavy traffic.
(A) Anticipating a bag
of microwave popcorn (B)
and a couple of hours in front of the television
(C) as her reward for
a hard day at work.
You wanted to do this:
Karlene drove slowly through the heavy traffic. Anticipating a bag of microwave
popcorn, and a couple of hours in front
of the television as her reward for a hard day at work.
Adding a comma after popcorn causes a problem. You do not use a comma with and when you are connecting only two items.
You might want to review the rules.
Go back to the sentence to try again.