Concept:
Pandit Sharangadeva's 13th-century musicological text *Sangeet Ratnakar* is traditionally known as the *Saptadhyayi* because it is organized into exactly seven specialized chapters (*Adhyayas*).
Step 1: Verify the names of the seven canonical chapters.
The seven chapters contained in the text are:
• {Svaragatadhyaya (Sound, notes, and registers) \(\rightarrow\) (B)
• Ragavivekadhyaya (Ragas)
• Prakirnakadhyaya (Performance practices)
• Prabandhadhyaya (Composition forms)
• {Taladhyaya (Rhythmic time and cycles) \(\rightarrow\) (D)
• Vadyadhyaya (Musical instruments)
• {Nartanadhyaya (Dance) \(\rightarrow\) (E)
Step 2: Eliminate incorrect options.
Reviewing the list, *Sampakveshtakha* and *Udghatta* are the names of ancient *Margi Taals*, not chapters of the treatise. Thus, items A and C are incorrect. The correct chapters listed are Swargatadhyay (B), Taladhyay (D), and Nartanadhyay (E), which corresponds to option (4).