Which sentence uses coordinating conjunctions incorrectly?


A)
The doctor sighed as he started his day, but he knew he had important
work to do.

B)
I wanted to ride the Groovin' Roller Coaster, so I chickened out at the last
minute.

C)
Little Jonathan wanted to go to the pool, and little Jessica immediately said
she did too.

D)
Marie knew that it hadn't rained for weeks, so she spent extra long today
watering the flowers.