During World War I, airplanes were most often used for:
O
A. transporting goods.
B. launching chemical weapons.
O
C. observing enemy positions.
D. clearing barbed wire.

B

Explanation:

Throughout World War 1, airplanes were most often used for "Bombing targets on land" since this was seen as one of the most effective ways to hurt the enemy.

a causal relation between two events exists if the occurrence of the first causes the other. the first event is called the cause and the second event is called the effect. a correlation between two variables does not imply causation.

explanation:

i know number 8 is something about only using 3/5 of the slave votes.