Consider the following pairs:Terms sometimes seen in news - Context/Topic1.Belle II experiment - Artificial Intelligence2.Blockchain technology - Digital/Cryptocurrency3.CRISPR-Cas9 - Particle PhysicsWhich of the pairs given above is/are correctly matched?

1. 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.

2. 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.

3. 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.

4. 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.