The first imperial conference was held in the year

Analyze the question: It asks for the year of the first Imperial Conference, a meeting of leaders of the British Empire.

Explain the concept: The Imperial Conferences were meetings between the British government and the leaders of the self-governing colonies (the Dominions, such as Canada, Australia, New Zealand, South Africa and Newfoundland). They were held to discuss defence, trade, and how the Empire should be run.

Before these, there were Colonial Conferences (1887, 1897, 1902, 1907). At the 1907 Colonial Conference, it was decided that future meetings would be called Imperial Conferences, and that they would be held regularly (every four years). The 1907 meeting is therefore generally counted as the first one held under the title "Imperial Conference." Later ones followed in 1911, 1921, 1923, 1926 (which produced the Balfour Declaration) and 1930, and 1937.

Step-by-step solution:

1. Options A (1900), B (1903), C (1905) and E (1909) do not match any Imperial Conference.
2. The 1902 conference was still called a Colonial Conference, and it is not among the options anyway.
3. The 1907 conference was the first to be formally named the Imperial Conference.
4. This matches option D.

Answer: D. 1907

Exam tip: Remember the sequence "1907, 1911, 1921, 1926." The conference name changed from "Colonial" to "Imperial" in 1907, and 1926 is the famous one with the Balfour Declaration on Dominion equality.