Joseph Chamberlain Promoted the Idea That

Joseph Chamberlain promoted the idea that:

A) the British should create a worldwide trading area that would secure raw materials and food, markets for exports, and so on.
B) the dominions with "imperial preference" should remain under the governmental control of the British sovereign.
C) the British dominions should compete with each other by means of protective tariffs.
D) the British dominions should work together economically but face military challenges independently.