Final answer:
The outcome of the Shelby v. Holder decision was the weakening of the Voting Rights Act and the elimination of the preclearance requirement in Texas.
Step-by-step explanation:
The outcome of the Shelby v. Holder Supreme Court decision was a. it weakened the Voting Rights Act and preclearance is no longer required to change electoral rules in Texas. In the Shelby County v. Holder (2013) case, the Supreme Court ruled that the formula for placing states on the Voting Rights Act's preclearance list was outdated and reached into the states' authority to oversee elections. As a result of this decision, the preclearance requirement was no longer in effect, making it easier for states to change electoral rules without federal approval.