At the end of scene 4, what does romeo fear?

Romeo voices his concern that he has a feeling that the night’s activities will set in motion the action of fate, resulting in untimely death. But, putting himself in the hands of “he who hath the steerage of my course,” Romeo’s spirits rise, and he continues with his friends toward the feast 

The answer is a. because i believe humans will travel to a new planet hopefully in the future.