user
In the fathers will, he states that his sons must race their horse, and the son with the slowest horse will receive the fathers entire fortune.  The two sons race, but never finish it, as they deliberately slow their horses.  After visiting the oracle the sons race horses as fast as possible.  What did the oracle tell them?
A: bulgaria
B: whip
C: swap horses
D: northeast
E: ghana
assistant
<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

<|end_of_thought|>

<|begin_of_solution|>

C

<|end_of_solution|>