C
Maria won this year' s local sailboat race by beating Sue, the winner in each of the four previous years. We can conclude from this that Maria trained hard. The conclusion follows logically if which one of the following is assumed?
A: Sue did not train as hard as Maria trained.
B: If Maria trained hard, she would win the sailboat race.
C: Maria could beat a four-time winner only if she trained hard.
D: If Sue trained hard, she would win the sailboat race.