What was one of the causes of tensions in europe that led to world war i?

a the nations in eastern europe wanted to unite as a single nation under the ottoman empire.
b germany, austria-hungary, and russia promised to send military support if a war broke out in europe.
c france, germany, and other nations were competing for overseas territory in africa and other places.
d britain cut off germany’s supply ships, and the german people were slowly starving.

I just took a test with this question and the answer is:

This is because all of them were competing for land in Africa and then wanted to grow in Europe as well as Africa. Although there are many other reasons for why world war 1 started, this is the correct answer for these options.

i cant if you dont give me the sentence or whatever.

man·u·script

/ˈmanyəˌskript/submit

noun

a book, document, or piece of music written by hand rather than typed or printed.

synonyms: document, text, script, paper, typescript

an author's text that has not yet been published.

thats all i can with. sorry. next time post the full question.