How did the american colonies gain the support of spain during the american revolution?

a. the colonies promised to allow spain to gain territorial control of cuba and the bahamas.
b. spain was hoping to regain gibraltar from the british, and after the battle of saratoga, had faith in the success of the colonies.
c. benjamin franklin traveled to spain and was able to persuade the royal court to put an embargo on british goods.
d. after the british navy fired on a spanish trading fleet, spain had no other choice but to join on the side of the colonies.