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
The correct answer is D. The details show that despite their illicit intentions, the men did not plan to hurt anyone.
The line from which Helen grey implies that the author thinks physical beauty is not the most valuable quality would be “but so you miss that modest charm; which is the surest charm of them all” there’s no focus on any physical attribute but instead on the modesty of Helen grey
