The correct answer is B. Courage.
Fortitude is the ability to withstand pain, hardship, or danger without giving up. It is a form of strength that comes from within, and it is often necessary to overcome difficult challenges. Courage is the quality of mind or spirit that enables someone to face danger, pain, uncertainty, or intimidation. It is often associated with bravery, but it can also be found in people who are simply determined to do what is right, even in the face of adversity.
The other options are incorrect because they do not accurately describe fortitude. Similarity is the state of being alike or identical. Protection is the act of shielding someone or something from harm. Safety is the state of being protected from or not exposed to danger or risk.