Concept:Josiah's reforms were triggered by the rediscovery of the Book of the Law, not by any political or foreign event.
Explanation:Josiah became king of Judah when he was only eight years old.
His great reforms took place in the eighteenth year of his reign.
At that time, the Temple in Jerusalem was being repaired and renovated.
During this work, Hilkiah the high priest found the Book of the Law in the Temple.
He gave the book to Shaphan the scribe, who read it aloud to King Josiah.
When Josiah heard God's laws, he realised that Judah had disobeyed God in many ways.
This discovery deeply moved Josiah and became the direct cause of his religious reforms.
His reforms included removing idols, repairing the Temple, and renewing the covenant with God.
The full account is found in 2 Kings 22–23 and 2 Chronicles 34–35.
Hence, the fall of the Assyrian Empire or Ahab's conduct did not influence Josiah's reforms.
Answer:The discovery of the law book (Option D).