Explanation:

- Ineluctable means unavoidable or inevitable, something that cannot be escaped or avoided.

- Option 1: Conquerable refers to something that can be overcome or defeated, opposite in meaning to ineluctable.

- Option 2: Irremovable suggests something that cannot be removed. While it hints at permanence, it doesn't fully capture the sense of inevitability implied by ineluctable.

- Option 3: Achievable means possible to accomplish, which contrasts with the inevitability and inescapability of ineluctable.

- Option 4: Surmountable means something that can be overcome or dealt with, opposite of ineluctable.

The correct answer is Option 2: Irremovable.