Answer:
Based on this i would say working hard is an important life skill however I feel like if I read the whole thing my answer would differ but I'm certain based on this paragraph that it isn't the last option but I haven't read the whole story so I'm not sure I would go with Working hard is a important skill
I think it had weakened it....(I THINK)
The voice in the sentence is a active sentence
I would say C, because irrevocable means not able to be changed, reversed, or recovered; final.
Hope this helps