An acid-base indictor has K b of 1.0 × 10⁻⁵ . The acid form of the indicator is red and the basic form is blue. Then:
A. pH is 8.4 when indicator is 80% red
B. pH is 9.6 when indicator is 80% blue
C. pH is 9.6 when indicator is 80% red
D. ph is 8.4 when indicator is 80% blue