U.S. top reasons among Americans for wanting Biden to step aside as nominee 2024

Which of the following is the biggest reason why you think Joe Biden should step aside as the Democratic nominee and allow another Democrat to run?以下哪一项是你认为乔·拜登（Joe Biden）应辞去民主党提名候选人职务，并允许其他民主党人参选的最主要原因？