JEE Main Chemistry question

An acid-base indicator has Ka=3.0×10⁻⁵. The acid form of the indicator is red and the basic form is blue. The [H⁺] required to change the indicator from 75% red to 75% blue is:

• (A)8×10⁻⁵ M
• (B)9×10⁻⁵ M
• (C)1×10⁻⁵ MCorrect
• (D)3×10⁻⁴ M