Get your grammar right! Live in the active voice rather in the passive, thinking more about what you do than about what happens to you. Live in the present tense, facing the duty at hand without regret for the past or worrying about the future. Live in the first person, criticizing yourself rather than finding faults with others.

The main point of the paragraph is to be in the present and take accountability of what you do. 

Option A: This addresses the concept of accountability but overlooks the importance of being in the present. 

Option B covers are all the messages of the text and would be the most appropriate summary of the paragraph. 

Option C: Worrying about the outcome can be related to thinking about the future, but that only makes up a small part of the text, omitting the idea of being in the present. 

Option D introduces the idea of being optimistic, confident and hard-working, which are not present in the paragraph. 

Therefore, Option B is the correct answer.