When the constitution was adopted in 1788, what was the original process for electing senators?

On September 30, 1788, Pennsylvania became the first state to elect its two senators. On March 4, 1789, the first group of elected senators reported for duty. From 1789 to 1913, when the Seventeenth Amendment to the U.S. Constitution was ratified, senators were elected by state legislatures.

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the first option is correct

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~courtney