A Student Calculates the POH for a 0

A student calculates the pOH for a 0.01 M triethanolamine solution to be 4.12.To simplify the math she decided to neglect the change in the formal concentration.Was she justified in her decision? K_b = 5.78 × 10⁻⁷

A) She was justified,as the change in ×,7.59 × 10⁻⁵,is less than 1% of the formal concentration.
B) She was not justified,as the change in ×,9.92 × 10⁻³,is greater than 1% of the formal concentration.
C) She was justified,as the change in ×,1.32 × 10⁻¹⁰,is less than 1% of the formal concentration.
D) She was not justified,as the change in ×,1.00 × 10⁻²,is greater than 1% of the formal concentration.
E) She was justified,as the change in ×,5.78 × 10⁻⁵,is less than 1% of the formal concentration.