Hardening in sugarcane plants occurs when

Answer: Option B

Sugarcane is a tall, stout, jointed, fibrous stalks, perennial grass that is used for sugar production as it is rich in sucrose. The stems grow into cane stalk, which when mature, constitutes around 75% of the entire plant.
Hardening in the sugarcane plant occurs when there is an increase in its sugar content.
A mature stalk is typically composed of 11% - 16% fiber, 12% - 16% soluble sugars, 2% - 3% non-sugar carbohydrates and 63% - 73% of water.