The correct answer is C. By allowing for the direct election of senators
Step-by-step explanation:
The purpose of the 17th amendment was to modify the election of senators, mainly by proposing these should be chosen by citizens. Indeed, before this amendment senators, who are part of one of the main institutions in the national legislature branch, were not selected by citizens but by the legislature of each state. This means most citizens did not have a vote into who should be a senator. Moreover, this change was positive to extend the democratic system because it extended the power citizens could have in government.