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# A food rule:-

$\begin{array}{1 1}(a)\;\text{Increases variety of food at each trophic level}\\(b)\;\text{Balances the inter relationships amongst organisms}\\(c)\;\text{Decreases variety of food ,but increases qty.of food at each trophic level}\\(d)\;\text{Increases variety as well as quantity of food at each trophic level}\end{array}$

Balances the inter relationships amongst organisms.
Hence (b) is the correct answer.