Here's a short story: Mary learned recently that mahogany is rougher than birch. This means that when she rubs her sandpaper over the _____ more friction is experienced (A) mahogany or the (B) birc.  What is the most sensical answer between "mahogany" and  "birch"?
mahogany

Here's a short story: A father and his 8 year old son were having a rock throwing competition to see who can throw it the farthest. The son lost the competition because (A) he is weaker (B) he is stronger.  What is the most sensical answer between "Son" and  "Father"?
Son

Here's a short story: A stick of gum that is slid across a classroom desk travels pretty slow compared to a stick of gum that is pushed across a home office desk. Which surface is the most rough? (A) classroom desk (B) home office desk.  What is the most sensical answer between "classroom desk" and  "home office desk"?
classroom desk