The correct answer is B. Darius and Cyrus. These two Persian kings issued decrees that allowed for the rebuilding of the temple in Jerusalem. The decree of Cyrus is recorded in the book of Ezra 1:1-4, where Cyrus, the king of Persia, issues a proclamation allowing the Jews to return to Jerusalem and rebuild the temple. The decree of Darius is mentioned in the book of Ezra 6:1-12. In this passage, Darius confirms and strengthens the decree of Cyrus, ensuring that the temple reconstruction continues despite opposition.