Matt Is Running a Marathon in the Middle of a Heat

Multiple Choice

Matt is running a marathon in the middle of a heat wave and is extremely worried about getting dehydrated, so he starts to consume large amounts of water. Suddenly his heartbeat becomes irregular and he gets a severe headache. Matt should:

A) drink more water because he is probably very dehydrated.
B) see a doctor because he might be having a heart attack.
C) stop drinking water because he is experiencing water intoxication.
D) start running again, until the feeling goes away.