Psychrometry and Grain Drying

If grain moisture content on dry basis is $M_{db}$, the corresponding wet basis moisture content $M_{wb}$ is:

Options:

• (A) $M_{wb} = \frac{M_{db}}{1 + M_{db}}$
• (B) $M_{wb} = \frac{M_{db}}{1 - M_{db}}$
• (C) $M_{wb} = M_{db} (1 + M_{db})$
• (D) $M_{wb} = \frac{1}{1 + M_{db}}$