Answer:
1,2 and 4 are correct.
Step-by-step explanation:
the german invasion of poland in 1939 was the beginning of world war 2. britiain and france declared war on germany.
in battle of britiain the Luftwaffe the german air force was using bombs to attack britiain they even raided on London. it included the loss of 10000 soldiers 2000 aircrafts on both sides
german military have been steadily modernizing ever since hitler came to power.
hitler formed the Wehrmacht the german army which included 13 million soldiers.
kriegsmarine the Navy which included 1200 u boats and 150 warships. stronger than the royal Navy.
the Luftwaffe air force which included 3.6 million soldiers and 120000 aircraft.
there is clear explanation for everything that hitler had immense military power than any other country in the world. hope it helps