Hey carcass/ Sandy
In this question why cant we have debate in Blank(i)
I justified myself that one can lose in a debate, causing debacle, However, not because of the failure of a dialogue

Can't a conference fail if it has no attendees or very low turnout?

No, you can not say that a conference has failed.
Conference cannot fail in itself, it can fail to deliver some objective...
say "responsibility for the failure of conference to deliver the desired result"

so 'in itself', it will be the dialogue that will fail
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Some useful Theory.
1. Arithmetic and Geometric progressions : https://greprepclub.com/forum/progressions-arithmetic-geometric-and-harmonic-11574.html#p27048
2. Effect of Arithmetic Operations on fraction : https://greprepclub.com/forum/effects-of-arithmetic-operations-on-fractions-11573.html?sid=d570445335a783891cd4d48a17db9825
3. Remainders : https://greprepclub.com/forum/remainders-what-you-should-know-11524.html
4. Number properties : https://greprepclub.com/forum/number-property-all-you-require-11518.html
5. Absolute Modulus and Inequalities : https://greprepclub.com/forum/absolute-modulus-a-better-understanding-11281.html

You are right. However, not all the time the official material has a clear-cut among the answer choices.

Look this question https://greprepclub.com/forum/since-she ... html#p6323

B is very very close and tempting but is wrong. it has a strong argument.

But what you are saying makes sense.

@edit

looking at the middle part of the sentence

he had no right to (ii) absolve himself. Which means that he was guilty and for a very good reason

it was his (iii) ________ that caused the debacle.


His bitterness or ill feeling (acrimony) was the only reason for the failure.

Skill and modesty are clearly out of scope.

Often a dialogue fails because we are ill-prepared or too emotional. Often skills or modesty are not implied if not in small amount.


From this

Regards
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