Can't is the word that is foe to ambition,
An enemy ambushed to shatter your will;
Its prey is forever the man with a mission
And bows but to courage and patience and skill.

The first line above uses the phrase "foe to ambition ".What is a "foe to ambition "?

A-a friend who helps you finish a job
B-a person who gives up on a task
C-an enemy who works against your goals
D-a person fighting to overcome a bad habit