A B-flat major triad contains which of the following notes

A. C
B. D
C. E
D. F sharp

A. C

C. E
D. F sharp

A B-flat major triad contains the following notes:

A. B-flat
C. D
E

To determine which notes are included in a B-flat major triad, we need to understand the basic structure of a triad and the notes in the B-flat major scale.

1. A triad is a three-note chord consisting of a root, a third, and a fifth. In the case of a major triad, the third is a major third above the root and the fifth is a perfect fifth above the root.

2. The B-flat major scale consists of the following notes: B-flat, C, D, E-flat, F, G, and A.

Now, let's apply this knowledge to identify the notes in a B-flat major triad.

Starting with the root note, which is B-flat, let's count a major third above it. In the B-flat major scale, the major third after B-flat is D. So, D is the note that makes up the major third in the B-flat major triad.

Next, let's count a perfect fifth above B-flat. In the B-flat major scale, the perfect fifth above B-flat is F. Therefore, F is the note that makes up the perfect fifth in the B-flat major triad.

Based on this, the notes included in a B-flat major triad are:

A. B-flat (root note)
B. D (major third)
C. F (perfect fifth)

Therefore, none of the given answer options (C, E, or F sharp) are correct.