Parents who consistently laud their children for every attempt to accomplish something, whether successful or not, actually erode the youngsters' sense of self-esteem.
Conclusion
Parents who consistently praise their children for every attempt to accomplish something, whether the kids were successful or not in their attempt, actually erode the youngsters' sense of self-esteem.
Evidence
If children are uniformly praised for both what they attempt and successfully accomplish as well a what they attempt and fail, they will eventually discount all words of praise and, in effect, stop hearing any praise at all.
Evaluate
Whenever we do Main Conclusion (and Role) we read the paragraph differently, knowing that 90% of the time the conclusion is the very first sentence, or it's some rebuttal signified with a pivot word (like "but, yet, however").
As we read this first sentence, we immediately ask ourselves whether it's eligible to be a conclusion (does it sound like an opinion coming from the author?)
This first sentence makes a causal claim, so it's not clear whether to hear it as opinion or accept it as fact. But it is definitely the author talking. If next claim or two feel like the author is trying to support / defend that opening claim, then we can confirm our suspicion that the first claim was the conclusion.
Indeed, the 2nd and 3rd sentences combine to explain how constantly praising your kids would erode their self-esteem.
Goal
We know the first sentence is the main conclusion, so we're just looking for whatever answer best matches the meaning of the first sentence.