Step 1: Understanding the Buddhist Causal Wheel.
The Buddhist Causal Wheel illustrates the interconnected causes and conditions leading to suffering and reincarnation. - Trsna (craving), Nama-Rupa (name and form), and Sadayatana (six senses) are the links connecting the present existence to the cycle of birth and rebirth. - Jara-marana (old age and death) represents the final link in the cycle, occurring subsequent to the present life.
Step 2: Conclusion. The correct answer is 3. Jara-marana.
Final Answer: \[ \boxed{\text{The correct answer is 3. Jara-marana.}} \]