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Assertion (A): Carbon would form an interstitial solid solution with iron:

Reason (R): The atomic radius of iron is smaller than that of carbon. 

(a)  Both A and R are  true and R is the correct explanation of A

(b) Both A and R are  true but R is not the correct explanation of A

(c) A is true but R is false

(d) A is false but R is true         

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