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Each day Gwen trains to compete in triathlons. Her training involves different combinations of running, swimming and biking. She runs at a rate of $30$ minutes for $5$ miles, swims at a rate of $30$ minutes for $1$ mile , and bikes at a rate of $1$ hour for $20$ miles. Which of the following is a true statement regarding Gwen's opportunity costs?

A

If Gwen chooses to run $5$ miles, her opportunity cost is swimming $1$ mile and biking $10$ miles.

B

If Gwen chooses to swim $1$ mile, her opportunity cost is running $5$ miles and biking $10$ miles.

C

If Gwen chooses to ride her bike $20$ miles, her opportunity cost is running $5$ miles.

D

If Gwen chooses to run $5$ miles, her opportunity cost is swimming $1$ mile.

E

If Gwen chooses to swim $1$ mile, her opportunity cost is biking $20$ miles.

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