A) John admits to eating the doughnut and says something lukewarmly patronizing. The result: Elly loses it and yells at him.
B) Mike admits to eating the doughnut and says something neutral that Elly misconstrues as an example of bratty defiance. Result: See Example A.
Actually, it's (C): "Let's rip off Art Linkletter."
Panel 1: We start with Lawrence and Michael standing outside and arguing back and forth ("They do NOT!! Do so. They do not. Do so") about something.
Panel 2: We shift focus to inside where Elly is tidying up; their continued bickering ("I don't believe you!! Well, it's true.") gets her attention.
Panel 3: We go back outside to see Lawrence say "Let's ask your Mom" and mike say "Yes, let's" as Elly looks out the window.
Panel 4: Elly's face is frozen in the Bug-Eyed Glare of Existential Horror as Mike asks her to confirm the truth ("Mom, are there bathrooms in Heaven?") that Lawrence didn't want to believe.
Summary: This is meant to "prove" that children are loaded with silly misconceptions like this and parents have a tough time keeping up. The problem is that Elly would be just as paralyzed if Mike had asked "What's the capital of Manitoba?" or "What's six times eight?" because she's what I was raised to call [BOXCAR]ing dumb.