Discussion
Assertion (A): Lattice matching is a useful guide to ice nucleating ability.
Reason (R): A surface resembling the ice lattice lowers the barrier to forming an ice embryo.
Answer: C
Both are true and the reason gives the principle, and silver iodide was chosen for seeding on exactly this basis. Surface defects and chemistry matter as well, so the match alone does not settle it. Empirical measurement remains necessary for any candidate material.
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