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This question tests understanding of refrigerator dehumidification and moisture transfer. Option A is wrong. Freezing moisture inside biscuits would make them hard and icy not crispy in the normal sense. Also the main refrigerator compartment is above 0 degrees C so moisture does not freeze inside the biscuits. The crispiness is due to moisture REMOVAL not freezing. Option B is wrong. Refrigerators do not release any dry chemicals. They cool air mechanically using a refrigeration cycle. No chemical reactions that absorb moisture occur inside a refrigerator due to chemical release. Option C is CORRECT. The image states: मीठी बिस्कुट को फ्रिज के अन्दर रखने पर वह कुरकुरे हो जाते हैं क्योंकि आर्द्रता अवशोषित होकर द्रव रूप में बाहर निकाल दी जाती है. The air inside a refrigerator is very cold and dry. When soft biscuits containing moisture are placed in this cold dry air the air absorbs the moisture from the biscuits (since refrigerator air has very low humidity). This moisture then condenses on the cold surfaces of the refrigerator (especially the freezer coils) and drips down as liquid water which is drained away. With the moisture removed from biscuits they become dry and crispy again. Option D is wrong. There is no specific radiation from refrigerators that would cause crispiness. The mechanism is purely moisture removal by dry cold air.
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Heat is a form of energy that transfers between objects or systems due to a temperature difference, moving from a hotter body to a cooler one until thermal equilibrium is reached.
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