1. which of the following chords are major triads? (picture)
a. a and b
b. a and d
c. c
d. d

2. arpeggio is another word for
a. triad
b. broken chord
c. harmony
d. consonance

3. a triad is a note chord
a. two
b. three
c. four
d. five

4. the top note of the triad is called the
a. root
b. third
c. fifth
d. octave

5. the interval between the root and the third of a major triad is made up of half steps
a. three
b. four
c. five
d. six

6. in a major key, major triads can be built on which scale degrees?
a. first
b. fourth
c. fifth
d. all above

As far as I understood, you should have attached this pic.
In this case, here are the answers 
1)  I can see there two major triads, so the answer is obviously A and B.
2) When the chord is not capabable for using and does not sound properly broken we use word Arpeggio, so the answer is B
3) A triad is the fifth note chord, which is a set of three notes. B
4) The top note of the triad is called the fifth, according to the basic rules, so the answer is C
5) The interval between the root and the third of a major triad is made up of  four half steps which makes it sound smooth and holistically.
6)  In a major key, major triads can be built on all above scale degrees as it is the most flexible point. 

I do hope you will find it useful! Regards.