Concept: an abstract idea; a general notion.
Notion: a conception of or belief about something.
Repetition: the action of repeating something that has already been said or written.
Misconduct: unacceptable or improper behavior, especially by an employee or professional person.
Tuition: a sum of money charged for teaching or instruction by a school, college, or university.
DEFINITELY the correct answer is choice A. None of the other options come close to the meaning of concept.
I hope this helps you and have a great day!! :)
