The major disadvantage of liquid nitrogen freezing is–

Correct option is C

Option (c): Correct
• Liquid nitrogen freezing is extremely efficient and gives ultra-small ice crystals, but the major disadvantage is its high operational cost.
• Equipment and nitrogen consumption make the process expensive.
Option (a): Incorrect
• Low boiling point is an advantage, not a disadvantage.
Option (b): Incorrect
• Contact with food is uniform in spray/immersion systems.
Option (d): Incorrect
• Liquid nitrogen is inert and non-toxic; it does not react with food.