The correct way 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 an active voice ("we smelled") and maintains proper verb mood.