Step 1: Identifying the philosophers and their time periods.
- Chanakya was a 4th-century BCE scholar and advisor, known for his work in economics and politics.
- Bhartrhari was a 6th-century philosopher and grammarian.
- Adishankara was an 8th-century philosopher and theologian.
- Nagarjuna was a 2nd-3rd century philosopher, best known for his work on the concept of emptiness in Buddhism.
Step 2: Conclusion.
The correct order is (D) Chanakya, Bhartrhari, Adishankara, Nagarjuna.