I am testing my students' logic. What is the answer they should choose between "saran wrap" and "toilet lid"? Logic test: Sue wrapped saran wrap over the bowl of her toilet and dropped a potato in the middle of it. The potato fell straight through.  She then put down the toilet lid and conducted the experiment again, and the potato bounced harmlessly off the lid.  That's because (A) the saran wrap is thinner (B) the toilet lid is thinner
saran wrap