A) Bass
Those were the insturments used.
Acoustic instruments.
Simple chord progressions such as C-F-G or Am-G.
Simple time signatures such as 3/4 or 4/4.
"Sharp" or natural keys such as C, D, E, G or A.
Simple scales such as pentatonic minor (blues), pentatonic major, major, melodic minor and mixolydian.
I believe the answer you're looking for is B. Guild.
Answer:
Must have four sides, must be able to open and close properly, and must be in the shape of a box.
Explanation:
That is what i could think of.