Final answer:
Friar Laurence from Act V, Scene 3 of 'Romeo and Juliet' best reflects the idea that overlooking important details can have grave consequences, as his failure to ensure Romeo knew of Juliet's feigned death leads to both of their demises.
Step-by-step explanation:
In Act V, Scene 3 of Romeo and Juliet, the character that best reflects the idea that overlooking something can have consequences is C) Friar Laurence. Friar Laurence is the one who devises the plan for Juliet to fake her death, which ultimately leads to the tragic end. However, it's his oversight in not ensuring Romeo was informed about the plan that leads to the irreversible consequences. Romeo, believing Juliet to be truly dead, kills himself. Juliet awakens to find Romeo dead and subsequently takes her own life. This cascade of misunderstandings and tragic events could have been prevented had Friar Laurence taken greater care to communicate the details of his plan.