Answer:
B and D
Explanation
A is wrong as the Japanese fleet never recovered fully from the battle of Midway.
B is correct as every island that US troops landed on would have fierce Japanese resistance with it only getting worse the closer US troops got to Japan.
C is incorrect as the Japanese were not at all developing any atomic weapons.
D is correct as many firebombing missions on Tokyo and other cities led to many civilian casualties yet the Japanese continued to refuse surrender even though the capital was beginning to look more like a pile of ash rather than a city.
E is incorrect as the idea of the bomb was to be so devastating that Japan would surrender immediately after the first bomb.