The correct choice to edit the incorrect use of verb voice and mood in the sentences is:
B.
An hour after Sheila placed the lasagna in the oven, we smelled a tantalizing aroma and our stomachs began to growl. "Take it out of the oven, and then you should cut everybody a slice," Cynthia said to Sheila.
This option uses the active voice correctly and maintains a consistent mood in the dialogue.