Psychrometry and Grain Drying

The primary operational feature of the LSU grain dryer that prevents thermal stress cracking in paddy is:

Options:

• (A) Continuous mixing and alternating exposure to hot drying air followed by tempering zones as grain flows downward under gravity
• (B) Drying with pure steam at $150^\circ\text{C}$
• (C) Using vacuum freezing
• (D) Zero airflow