The correct option is C Calcium alginate beads
An immobilized enzyme is an enzyme that is attached to an inert, insoluble material such as calcium alginate. This can provide increased resistance to changes in conditions such as pH or temperature. It also allows enzymes to be held in place throughout the reaction, following which they are easily separated from the products and may be used again. For example, the immobilization of the yeast cells on calcium alginate.