Hydrazine N₂H₄, (Kᵦ = 1.3 x 10⁻⁶) is a product used as a rocket propellant, in the synthesis of various pesticides, and sometimes as medicine. Determine the pH of the solution obtained when:

A) 0.01 M hydrazine is dissolved in water.
B) 0.1 M hydrazine is dissolved in water.
C) 1.0 M hydrazine is dissolved in water.
D) 0.001 M hydrazine is dissolved in water.