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Which method can be used to prepare iron nitriles nano-crystals using ammonia gas?

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Which method can be used to prepare iron nitriles nano-crystals using ammonia gas?

(a) Pulsed laser deposition

(b) Sol-gel technique

(c) Electro-deposition

(d) Mechanical crushing

I have been asked this question during a job interview.

My question is from Nano Phase Materials topic in portion Advanced Engineering Materials of Engineering Physics II

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Right option is (d) Mechanical crushing

Explanation: Mechanical crushing is the method sued in the preparation of metal oxide nano crystals. In this method, small balls are allowed to rotate inside a drum and are made to fall on a solid with a high gravitational force that crushes the solid into nano-crystals. Thus iron nitriles nano-crystal can be made by using mechanical crushing.

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