PLEASE I DESPRITALLY NEED HELP Why did European nations develop new weapons in the early 20th century?

to prevent a war
to eliminate the need for artillery
to prepare for a possible war
to reduce the size of the military

i would say the answer is C

Explanation:

hope it helps sorry if im wrong

a) token economy

Explanation:

Token economy is a way of management which is run by the continuously reinforcing the behavior of a person. The thing which is used to continuously reinforcing the behavior is called a token. Token economy is based on operant conditioning and behavioral economics.

Here, the behavior of the children of memorizing the poem and reciting it is being encouraged by the use of stickers. The stickers here are the tokens.