The correct option is B Flavoproteinsand Cytochromes
Flavoproteins & cytochromes are enzymes of the ETC complexes, these complexes are found in the inner mitochondrial membrane.
Enolase and hexokinase are glycolytic enzymes and are therefore found in the cytoplasm, whereas catalase is an enzyme that breaks down hydrogen peroxide and is found in an organelle called peroxisome. Zymase is an enzyme involved in alcohol fermentation. Citrate synthetase is an enzyme of the Kreb's cycle and is found in the mitochondrial matrix.