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Explanation:

∵ pqr = 1

Case 1:

Let p = 2/3, q = 3/2 and r = 1

Substituting the values of p, q, r, we get,

11+p+q-1+11+q+r-1+11+r+p-1=37+27+27=1

Case 2:

Let p = 1, q = 1 and r = 1

Substituting the values of p, q, r, we get,

11+p+q-1+11+q+r-1+11+r+p-1=13+13+13=1

Hence, option (c).

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