Doubt from friction

Question no 13 i am getting option D as answer but answer key says option C is correct

Option D is 3root3/8mg

When two bodies are kept in contact , contact force start acting , and is equal to (N^2+f^2)^1/2 so the correct answer is mg

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@Achyut_2020 shouldn't the correct answer be (b) then?? Normal force acting on block is mgcos30 and friction 3/4 times normal force ...correct me if I am wrong..

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We see here maximum value of f is 0.6mg and from fbd f is 0.5 mg so fwill be 0.5mg

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