In the questions given below, a sentence is given,

Solution

Part D is the odd part. B opens the sentence by establishing the foundational reason — the complexity of human metabolism means that.  A follows directly as the consequence of that complexity — decades of nutritional science have failed to.  C continues by specifying what nutritional science has failed to produce — a universal dietary framework that accounts.  E concludes by completing that framework description — for individual variation in gut microbiota and genetic response. So the logical chain is: B → A → C → E, forming — "The complexity of human metabolism means that decades of nutritional science have failed to produce a universal dietary framework that accounts for individual variation in gut microbiota and genetic response." D is the odd part because it introduces a specific biochemical fact — the liver processes fructose differently from glucose — which is a standalone technical detail about hepatic metabolism. While it loosely relates to the broad theme of nutrition, no other part introduces, builds upon, or requires this biochemical distinction. It neither connects to the subject of metabolic complexity being discussed nor to the argument about the failure of dietary frameworks, making it an isolated fragment that disrupts the coherence of the sentence.