The most accurate response is: The Allies needed to maintain shipping lanes through Egypt.
North Africa, particularly Egypt, was crucial for the Allies during World War II primarily due to its strategic location, which allowed for the control of vital shipping routes, particularly through the Suez Canal. This canal was essential for facilitating maritime trade and military logistics between Europe and Asia. Securing the shipping lanes through Egypt ensured that the Allies could transport troops, resources, and supplies efficiently, which was critical for maintaining their war efforts against the Axis powers.