which sentence uses a formal style that is appropriate in an informational piece of writing?

watching a swarm of bees fly across my neighbor's roof and into his garage was an incredibly cool sight.

bees are an important ally of humans because they pollinate one third of the food, including most fruits, nuts, and vegetables.

being a beekeeper is probably an awesome job, but i wouldn't want to have to wear all that heavy clothing, especially in the summer.

bees are supposed to be good for us, but i'm really terrified about getting stung by one.