Correct option is (c) Phase separators
To explain: Restriction of the enzyme to the aqueous phase effectively immobilizes the enzyme and allows its straightforward separation from product-containing organic phase by use of phase separators. Centrifuge is used for centrifugation which separates on the basis of the particle size and density difference between the liquid and solid phases. Chromatography is used for separation of a mixture by dissolving the mixture in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase. Ultrasonicator is utilized to break up, disperse and sheer target material samples through its focused ultrasonic frequencies.