Peter and Roland Are Trying to Figure Out If They

Peter and Roland are trying to figure out if they can mow the yard before they go to soccer practice. Peter says, "Let's just try it." Roland says, "We can figure this out. Walk with the mower across the yard and I'll time you. Then we'll estimate how may swipes it will take and get a total time." Roland is thinking like someone using _____.

A) idealism
B) concrete operations
C) hypothetical-deductive reasoning
D) conservation