The correct option is B Both synthesize and breakdown molecules
Amphibolic pathways are pathways that are both catabolic and anabolic in nature. That is, the substrates produced in these pathways can be sent into the oxidative phosphorylation cycle to be broken down to produce ATP, or they can be recycled into any of the anabolic pathways for production of important biomolecules. Glycolytic pathway, Kreb's cycle etc are examples for amphibolic pathways.