B. The most beautiful moments of Life are brief
Abstract nouns are nouns that the five senses can not detect. Honesty is like honestly. You cannot see honesty, you can not feel honesty, you cannot see honesty, you can not taste honesty, and you can not hear honesty. So, it is an abstract noun.
The moon was a ghostly galleon tossed upon cloudy seas
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I would say definitely use your time wisely. Make sure you are fully focused too. Though it may be difficult to focus, (I understand) try and find some outside resources that can help you bring interest into what you're learning in any subject.
