Question: Here's a short story: Alice rolls a tennis ball and a bowling ball down a hill.  She notices that the (A) tennis ball (B) bowling ball speeds up faster..  What is the most sensical answer between "tennis ball" and  "bowling ball"?
Answer: tennis ball

Question: Here's a short story: Tom's paper plane heated up less when he flew it through the air compared to when he slid it over the table. He learned that the _____ had less friction (A) air (B) table.  What is the most sensical answer between "air" and  "table"?
Answer: air

Question: Here's a short story: Bill throws a boulder and a balloon. The balloon falls much slower than the boulder meaning it (A) weighs more (B) weighs less.  What is the most sensical answer between "balloon" and  "boulder"?
Answer:
boulder