One of Khalil’s sheep got out of its pen, and he found it in a field full of sorghum. Khalil knows that sorghum has cyanide in it and could be deadly for the sheep. He calls the vet, who comes out. Within 15 minutes, the sheep is breathing heavily and staggering as it walks. The vet tells Khalil he will do what he can. He says that if the sheep survives past the first ____, he has a much greater chance of recovering.

A.
20 minutes

B.
1 hour

C.
2 hours

D.
24 hours