Step 1: Identification of Velar Sounds.
Velar sounds are articulated at the velum (the soft palate). Common velar consonants include k, g, and ng.
Step 2: Evaluation of Options.
- (1) A, k, g, m: Contains velar sounds k, g, and ng. The sound 'A' is a vowel and not typically classified as a velar consonant. However, when considering common velar consonant sounds, this option includes the core ones.
- (2) A, m, ng, g: Includes velar sounds ng and g. 'm' is bilabial. 'A' is a vowel. Incorrect.
- (3) B, ph, th, kh: 'B' is bilabial. 'ph' is labiodental. 'th' is dental. 'kh' is a velar fricative, but this is not a primary set of velar stops. Incorrect.
- (4) D, k, kh, g: Includes velar sounds k and g. 'D' is alveolar. 'kh' is a velar fricative. Incorrect as a basic velar set.
Step 3: Determination.
Option (1) most closely represents a set that includes common velar sounds (k, g, ng), despite the inclusion of a vowel. Therefore, option (1) is the correct answer.