Mark the consequence if it is intentional.

A.
Spanish conquistadors bring their horses with them across the Atlantic. Some horses escape or swim to shore after a ship sinks. The Plains Indians become expert horsemen and buffalo hunters.

B.
Rats are aboard European ships coming to the Americas. The rats spread disease and hunt unknown numbers of smaller animals to extinction.

C.
Columbus brought pigs to the Americas on his second voyage. The pigs provided a valuable source of food for a growing population.

Question

Mark the consequence if it is intentional.	
 
 A.
Spanish conquistadors bring their horses with them across the Atlantic. Some horses escape or swim to shore after a ship sinks. The Plains Indians become expert horsemen and buffalo hunters.
 
 B.
Rats are aboard European ships coming to the Americas. The rats spread disease and hunt unknown numbers of smaller animals to extinction.
 
 C.
Columbus brought pigs to the Americas on his second voyage. The pigs provided a valuable source of food for a growing population.