The oxygen absorber used in Modified Atmospheric Storage (MAS) is:

Correct option is C

Ferrous oxide is used as an oxygen absorber in Modified Atmospheric Storage (MAS) to reduce oxygen levels and extend the shelf life of fresh produce.
(a) Calcium carbonate: Not used for oxygen absorption.
(b) Sodium chloride: Common salt, not an oxygen absorber.
(d) Silicon dioxide: Used as an anti-caking agent, not for oxygen absorption.
Important Point: Reduced oxygen levels slow down respiration and delay spoilage of perishable produce.