All the charts will be displayed _____ the class and the group _____ the best drawing will be the winner.

All the charts will be displayed _ the class and the group _ the best drawing will be the winner.

At - with

In - with

On - in

None of these

Correct sentence: "All the charts will be displayed in the class and the group with the best drawing will be the winner."

"In the class" shows location; "with the best drawing" shows possession.