When the rate of movement of the ice front is 30–100 mm/hr, it is:

Correct option is B

Correct Answer: (b) Rapid freezing
Explanation:
→ Ice-front movement of 30–100 mm/hr corresponds to rapid freezing, which produces moderately small ice crystals.
→ Better than slow freezing in retaining texture.
Information Booster:
→ Faster freezing → less cellular damage → higher product quality.
Additional Information (Other Options):
(a) Slow: < 10 mm/hr
(c) Quick: > 100 mm/hr
(d) Ultra-rapid: extremely fast freezing methods like cryogenic freezing.