Step 1: Meaning of Pratishakhya.
Pratishakhya texts are phonetic treatises attached to each Veda.
They explain rules of pronunciation, sandhi (euphonic combination), intonation, and recitation style of Vedic mantras.
Step 2: Samaveda Pratishakhyas.
Samaveda has two important Pratishakhya texts:
1. Pushpasutra (also called Pushpasutram).
2. Riktantra.
These works deal with the phonetic details and chanting style unique to Samaveda.
Step 3: Eliminating wrong options.
- (C) Vajasaneyi Pratishakhya: Belongs to Shukla Yajurveda, not Samaveda.
- (D) Rik Pratishakhya: Belongs to Rigveda, not Samaveda.
Step 4: Conclusion.
Thus, the two Pratishakhyas of Samaveda are Pushpsutram and Riktantram.