The best way to edit the issues with verb voice and mood in these sentences is option B:
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") instead of the passive voice, which makes it clearer and more engaging. Additionally, it maintains the natural flow of dialogue and ensures consistency in verb mood.