In terms of intervals, what makes a major interval?

A major interval is defined by the number of half-steps between the two notes involved. Specifically, a major second consists of two half-steps, a major third consists of four half-steps, a major sixth consists of nine half-steps, and a major seventh consists of eleven half-steps. This pattern distinguishes major intervals from their minor counterparts, which have fewer half-steps.

Considering the intervals stated in option C—second, third, sixth, and seventh—they all represent major intervals. For example, a major third is the interval between two notes that are four half-steps apart, while a major seventh is an interval spanning eleven half-steps. Thus, option C comprehensively includes all the intervals that are classified as major in Western music theory.

The other options list intervals that either mix major and minor qualities or focus only on specific intervals that do not encompass the full range of what defines major intervals. Therefore, option C is the most accurate representation of major intervals in music theory.