A major 7th chord consists of which intervals?

A major 7th chord is built from a major triad and an additional major 7th interval above the root. To break this down, the major triad consists of the root, major third, and perfect fifth. When you add the major 7th, which is a whole step below the octave of the root, you complete the structure of the major 7th chord.

For example, in the key of C major, a C major triad consists of the notes C, E, and G. Adding B, which is the major 7th interval above C, forms the C major 7th chord (C-E-G-B). Hence, this combination of a major triad plus a major 7th creates the essential sound and quality of a major 7th chord.

This understanding clarifies why the chosen answer accurately describes the intervals of a major 7th chord.