The decision of the Supreme court in the case of Baker v. Carr, is that even if the population changes, the states must keep the districts for voting purposes to be equal.
Option A is the correct answer.
The Supreme Court is the highest authority whose decision in the court cases is considered to be final.
The case of Baker v. Carr describes the right of reviewing redistricting matters by the US federal courts. After the review, the final decision of the case was given by the Supreme court which require the states to make the voting districts similar irrespective of any change in population.
Therefore, the explanation in part A would represent the decision provided by the Supreme court in the mentioned case.
Learn more about Baker v. Carr case in the related link:
https://brainly.com/question/23128341
#SPJ1