Answer:
Defend and challenge are pretty much the opposite of each other here. To defend an argument is to persuade others why the argument is sound. To challenge an argument means you are arguing against IT.
Explanation:
Hello. You did not provide the text to which this question refers, which makes it impossible to answer it exactly, but I will try to help you in the best possible way.
The word "absolutely" means something complete that is presented in its entirety in an integral way. Another meaning that this word has is the sense of independence. Something absolute is something that does not need to relate to anything, nor depend on anything for what it is.
The answer to get it right is b hehehehe