What does the word incontrovertible mean as it is used in this quotation?

if this is a true or false question its true

quite an interesting way to teach topic sentences, because the answer to this question is the best definition of a topic sentence that one can present, it is as if answering the questions taught you how to do it, this is some real teaching, it is terribly well-done.

the topic sentence in this paragraph is:

topic sentences writers stay on track and keep a paragraph from becoming an aimless collection of sentences about an idea.

which incidentally tells you what a topic sentence should be.

b. and i with my fighting heart, i thought at

first / to steal up to him [the cyclops].   the cyclops’ actions first odysseus to take

action after killing his men and trapping in the cave revealed his intent of

doing them harm.   that is why odysseus

blinded him to enable him and his men to escape.

it is c because i got it right on my test