Which sentence has an error in parallel structure?
Charlotte didn't know which babit she found the most annoying: smacking
gum, tapping pencils, sending text messages, or sleeping in class.
The principal could never understand why teachers were late, failed to turn
in their lesson plans, and yet still complained incessantly all day long.
The teacher assigned an essay in which students needed to have a strong
thesis, to create a clear structure, and they needed to make a logically
progressive argument.
Each day at work at the ice cream shop, Ben needed to check the inventory
of ice cream, insure that all the workers showed up on time, and modify
the menu board's offerings.