Until Spring 1943, Perhaps Hitler's Greatest Opportunities of Defeating Britain

Until spring 1943, perhaps Hitler's greatest opportunities of defeating Britain and winning the war was

A) the possibility of a successful invasion across the English Channel.
B) that German U-boat would destroy Allied shipping.
C) the German V-2 rockets fired into Britain that would cause their terrified civilian population to demand Prime Minister Churchill to surrender to Nazi Germany.
D) that General Rommel would conquer Egypt and the Suez Canal.
E) that the American-British-Soviet alliance would collapse.