Right answer is (c) Immobilization of invertase enzyme
The best I can explain: The method in which the enzyme is entrapped within suitable gel or fiber. The matrix used for entrapment are calcium alginate, agar, collagen, diatomaceous earth, activated carbon, porous ceramic, calcium alginate, K-carr-a-genin etc. Calcium alginate is most widely used method for enzyme immobilization of microbial, plant and animal preparations. Immobilization of invertase enzyme is done by using activated charcoal adsorbent. This is adsorption method of immobilization.