Answer :
The correct answer should be B. They love what they do.
If you love what you do you will not consider it to be a bore or a difficulty and thus you will enjoy and be happy. Thoreau was very diligent and hard working because he believed this.
If you love what you do you will not consider it to be a bore or a difficulty and thus you will enjoy and be happy. Thoreau was very diligent and hard working because he believed this.