indisputable?

Any explanation here please?

One would hesitate to call Raymond’s argument__________ , even if it did put forth some convincing claims.

Note that we would hesitate to call the argument something even if it did put forth some convincing claims. So right now the argument is not convincing. So it is up for debate as it is not credible.

Now the hesitate part says that the we not call the argument something as it is not convincing. So the guess should be infallible. It is not infallible even if it did provide some convincing claims.

So the best choice and close words to the word infallible is indisputable which means that we can't dispute the argument. Also incommutable is the right choice because it means that the argument can't be changed or challenged.

Also the confusion is there in invincible which means that something is too strong or powerful to be defeated which is not normally associated with the argument and also it doesn't have the similar word in the answer choices because it is too strong.

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