Answer:
British Field Marshall Bernard Montgomery's contributions to the Allied war effort were:-
A. He planned and led the invasions of North Africa and Western Europe.
C. He defeated the Axis armies of Italy and Germany at El Alamein, Egypt.
Step-by-step explanation:
'Field Marshall Bernard' is known to be one of the most successful British commanders of World War II. He was also known as 'Monty'. He led the Eighth Army and won the first Allied land at 'El Alamein', Egypt.
He ordered the Allies against General 'Erwin Rommel' in North Africa, and was also successful in invading Italy and Normandy.
The Axis army of Italy and Germany suffered a decisive defeat by the British Eighth Army.