The correct answer is A. A witness to a crime doesn't know whether she should tell the truth
Step-by-step explanation:
In an internal conflict, the conflict or struggle is within the character who needs to fight against his/her fears, values, morals, perception, etc. This is the opposite of external conflict in which the character struggle against an external force, for example, another character or nature.
Option A is the clearest example of internal conflict because in this case, a female character struggles against her self as she debates between telling the truth about the crime she witnessed or probably lie about it, which means the struggle is within the character.