Made or consisting of wood. 2. Stiff and unnatural; without spirit: a wooden performance; a wooden smile. 3. Clumsy and awkward; ungainly.
D will be ur answer hope this helps :)
2 goes with the second one (control rods).
3 goes with forth one (mass of unstable fuel)
4 goes with one (shield)
1 goes with third one (moderator)
5 goes with coolant
Is there any option for this? Or is it a true or false question?