Option 1: (C), (B), (A), (D) -> "Okinawans stop eating when they feel their stomachs reach 80 percent of their capacity rather than overeating and wearing down their bodies with long digestive processes that accelerate cellular oxidation" - grammatically correct and logically coherent.
Option 2: (A), (C), (B), (D) -> Starts with "than overeating..." which cannot begin a sentence; breaks logical flow.
Option 3: (B), (A), (D), (C) -> Starts with "stomachs reach..." without a subject; sentence is fragmented.
Option 4: (C), (B), (D), (A) -> Places "rather" incorrectly, separating it from "than"; creates incomplete meaning.
Hence, Option 1: (C), (B), (A), (D) -> This sequence creates a complete sentence explaining the Okinawan eating practice of stopping at 80% stomach capacity rather than overeating, which helps them avoid the negative effects of excessive digestion and cellular oxidation -> correct