Answer:
C, Persistance.
Step-by-step explanation:
Persistance can be descrobed as continuing even with difficulty, which is exacty what is described on the question. Injury would indicate Francisco was somehow hurt, but rather the question just states he feels like giving up, not that he's injured and needs to. Intensity would be more so described if the text stated an important reason Francisco had to keep going or they stated an injury. Activation would be sued to describe Francisco as being active, but generally we do not see the word "activation" when the subject is a person. Yes, Francisco is active, but he's not "activation."
Finally, Persistance means to keep going when it's hard, to continue when it's difficult, to not give up, that's being persistant, or shwoing persistance. Therefore, the answer is C, Persistance.