Without knowing Armadillo's plan, it may appear by the sequence of events during the race that

• a. Coyote is the fastest runner of the two.
• b. Armadillo and Coyote are both very smart.
• c. Coyote was able to speed up at the end.
• d. Armadillo and Coyote kept the same pace.

c. Coyote was able to speed up at the end.