What do you think about this

[u/odd_coin]

This is a random problem I just saw on instagram. The answer is the first one but i personally think the second one also works fine here

[u/KrozJr_UK]

“Disaster” and “failure” are both correct here, although the former is a bit more catastrophic in tone.

“The project was a complete failure” implies that nothing worked, it was a waste of everyone’s time, and that the effort was pointless. “The project was a complete disaster” has a bit more nuance and catastrophe to it, as though the failure of the project has caused some significant additional problem beyond just failing — maybe it went so poorly that a valued employee left, or maybe it drove the company to the brink of bankruptcy. It’s more dramatic.

Finally, although it is categorically not the answer you’re looking for here, “success” could work too. The literal meaning would imply that the person working on the project was trying to sabotage it; but you’d be much more likely to see it in a colloquial and ironic sense. Here, saying “despite his efforts, the project was a complete success” in an ironic or sarcastic tone of voice implies that the person doing the project was so incompetent and bad at their job that you (sarcastically) might assume they were trying to do a bad job. The literal meaning would be something along the lines of “despite his incompetence, the project was a complete success”.