In a major key, the minor diatonic triads are a. mediant, dominant, and submediant. b. subdominant, dominant, and tonic. c. supertonic, subdominant, and dominant. d. supertonic, mediant, and supmediant.

The answer is option A.

Explanation:

In music, the submediant is the 6th scale level of the diatonic scale, the 'bring down mediant', somewhere between the tonic and the subdominant or 'lower predominant'. It is at times called superdominant, as the degree over the overwhelming (see additionally underneath, Theory.In a noteworthy key, the supertonic traid, the mediant sets of three and the submediant set of three are minor sets of three. Then again, the tonic group of three, the subdominant set of three and the prevailing set of three are real ternions.

i'm not too sure - if you could attach the picture