Correct answer: (b) 2 only
Explanation
- A
1 and 3 only
(a) 1 and 3 only. Belle II is a particle-physics experiment at SuperKEKB (B-meson factory), not artificial intelligence. CRISPR-Cas9 is a gene-editing tool, not particle physics. Both pairs 1 and 3 are mismatched. This option is not the key.
- B
2 only
(b) 2 only. Blockchain is the distributed-ledger technology underlying cryptocurrencies and related digital assets, so pair 2 is correctly matched. Pairs 1 and 3 swap fields. Hence only 2. This option is the official key.
- C
2 and 3 only
(c) 2 and 3 only. Pair 2 is right, but CRISPR-Cas9 is biology/genome editing, not particle physics. This option is not the key.
- D
1, 2 and 3
(d) 1, 2 and 3. Two of the three pairs are wrongly matched. This option is not the key.
Summary. Official key is (b) 2 only. Blockchain belongs with digital/cryptocurrency. Belle II is a collider experiment on B mesons, not an AI project. CRISPR-Cas9 is a programmable nuclease used in gene editing, not in particle physics. Only the second pair is therefore correctly matched. Options that keep Belle II or CRISPR in the wrong context fail.
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