The german air force was almost grounded by the time of the d-day invasion because
a. the germans feared their planes would be destroyed in the air.
b. the germans had little fuel due to allied bombing.
c. so many german pilots had been killed in the war.
d. so many german aircraft were in need of repair.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

the nationalists wanted a strong central government so the new country wouldn't fall apart.

- r3ktforgood ☕

the correct answer is ''the programs costs have risen dramatically in the recent past'' hope this !

the spanish  

hope this meaning spain btw