Which pair of functions correctly matches a vitamin-like nutrient with the mechanism by which it most directly supports cellular metabolism?

Lipoic acid — integrates into phospholipid bilayers to provide structural integrity to hepatocyte membranes and exported lipoproteins.

Choline — primarily oxidizes to acetyl-CoA in mitochondria and directly participates in electron transport chain complexes I and III.

Carnitine — shuttles long-chain fatty acids into mitochondria for β-oxidation, thereby supporting fat-derived energy production.

Inositol — directly donates acyl groups for lipid oxidation in mitochondria and functions as the rate-limiting enzyme cofactor in the Krebs cycle.