What was the most important preparation Ezra made for the journey to Jerusalem (Ezra 7:10)?

Some of the children of Israel, the priests, the Levites, the singers, the gatekeepers, and the Nethinim came up to Jerusalem in the seventh year of King Artaxerxes. And Ezra came to Jerusalem in the fifth month, which was in the seventh year of the king. On the first day of the first month he began his journey from Babylon, and on the first day of the fifth month he came to Jerusalem, according to the good hand of his God upon him. For Ezra had prepared his heart to seek the Law of the LORD, and to do it, and to teach statutes and ordinances in Israel.

Explanation:

the correct answer is d: "party organizers, volunteers, voters, and elected officials."

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