The answer should be D because it is stating something happy/nice at the beginning, but then it goes into the downside of the experiments. Which means you need a negative transition word
I dont know what rule u r talking about...but I can give u a sentence using the compound subject " clowning and crumping ".
Clowning and crumping are styles of dance that originated in the 90's.
It is so they have better access to more nutritious and fresh food.
