To determine which chords are major triads, we need to analyze the components of each chord (the root, third, and fifth). Major triads consist of a root, a major third above the root, and a perfect fifth above the root.
Since the options you provided (A, B, C, D) are not specified, I can't directly identify which of these are major triads. If you can provide the notes or details of chords A, B, C, and D, I can help you determine which ones are major triads.