The correct option is (d) It is based on stoke shift
The explanation is: “It is based on stoke shift.” It is true for spectrofluorometric method, and not luminescence method. Statements which are true for luminescence method are:
• The intensity of emitted light is used to study enzyme reaction.
• The reaction can be used to assay ATP and appropriate enzymes via coupled reaction.
• Bacterial luciferase can be assayed and measured by this method.