Look at Aquaman 's seahorse . That thing is pissed off about something . Maybe because it realizes its a seahorse , and it realizes it wants to be a shark . This leads me to surmise that this seahorse is crazy angry all the time .

Question: Why might Aquaman have a seahorse ?
Answer: None of the above choices .Aquaman just likes seahorses and helps them rid themselves of being angry and crazy .Aquaman has a place where sharks swim and the seahorses watch the area .Aquaman might live under water and the seahorse is his mode of transportation .