Correct answer: (b) 4 2 3 1
Explanation
- A
1 2 3 4
(a) 1 2 3 4. Black gold cannot lead: it is a 21st-century lab material, far after Kevlar and fullerene.
- B
4 2 3 1
(b) 4 2 3 1. Kevlar (1965) then fullerene (1985) then graphene (isolated 2004) then black gold (IIT Madras, 2019). (b) Official key.
- C
2 4 3 1
(c) 2 4 3 1. Fullerene before Kevlar is impossible: C60 is 1985, Kevlar is 1960s.
- D
4 1 2 3
(d) 4 1 2 3. Inserts black gold second, decades too early.
Summary. Official key is (b). Lab chronology: Kevlar 1965, fullerene 1985, graphene 2004, black gold 2019. Code 4 2 3 1.
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