Question

In a major key, major triads can be built on which of the following? I will give MEDALS!!!!!
first
fourth
fifth
all of the above

I will give MEDALS!!!!!!!!!

Answer 1

http://en.wikipedia.org/wiki/Major_chord
major triads are made of the root, third, and fifth

Answer 2

fifth @usernae

Answer 3

All of the above.

E.g. In C Major:
C E G
F A C
G B D