Which sentence includes an adverb answering the question "how often"?
O 1. Building a robot to quickly pickup trash and then leaving it operating inside her room led to Pam's new cleaning invention
2. Sean's vast improvement in his chess skills can easily be attributed to the fact that he never misses a chess club meeting.
3. Taking a dramatic fall off his bike, Charlie flipped entirely head over heels and landed hard on the ground.
4. Kendra thought that winter was the best time for being outside, since she loved skling deep into the woods.