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Thermoregulation will be expensive for animals with \begin{array}{1 1}(i)\;\text{large surface area}\\(ii)\;\text{small volume}\\(iii)\;\text{small surface area}\\(iv)\;\text{large volume}\end{array}

$\begin{array}{1 1}(a)\;\text{(i) & (ii)}\\(b)\;\text{(i) & (iv)}\\(c)\;\text{(iii) & (ii)}\\(d)\;\text{(iii) & (iv)}\end{array}$

Thermoregulation will be expensive for animals with large surface area & small volume
Hence (a) is the correct answer.