When and why was the finger known as "the ring finger" called that?

Before medical science discovered how the circulatory system functioned, people believed that a vein ran directly from the fourth finger on the left hand to the heart. Because of the hand–heart connection, they chose the descriptive name vena amoris, Latin for the vein of love, for this particular vein.

you didn't give any answers to choose from so i can't with this but, i do know something that the mexican government would be worried about and that is the wall that donald trump is currently trying to get up.