Spain Came to Regret Its Role in the Rise of the Comancher'a

Spain came to regret its role in the rise of the Comancher'a because

A) the Comanche would ally themselves with the British against Spain.
B) Comanche raids would later wreak havoc on Spanish settlements.
C) the Apaches and Navajos,which formed out of the Comancher'a,would pose a threat to them.
D) it was through the Comancher'a that the Spanish introduced horses to North America.