Why Did the British Seek to Achieve "Effective Occupation" of the Savanna

Why did the British seek to achieve "effective occupation" of the savanna region?

A) To stop the spread of Islam
B) To prevent the unification of Muslim Egypt and West Africa
C) To halt the French from seizing control of Egypt
D) To prevent the further centralization of Muslim power was centralized under the leadership of Usuman dan Fodio
E) To block a French-German alliance along coastal West Africa that threatened Britain's Suez Canal