Why did the state flag change to add the Confederate battle flag?

The Answer is B. (The Stars and Bars flag looked too much like the American flag.)

as a response to the Supreme Court rulings on desegregating schools.

Explanation:

On 13th February 1956, the Georgia's state Flag added Confederate Battle emblem in the flag. This change was made in the flag after the Supreme Court gave a verdict of desegregating schools. The legislation was signed by Governor Marvin Griffin to include Confederate Battle emblem on one-third part of the flag.

So, the correct answer is that the flag was changed in a response of the Supreme Court on desegregation of schools which was made null and void.