Answer is C
Explanation: it is c because you cannot expect the exchange student to know her name already and also we don't know if the teacher is a miss or Mrs. because it doesn't say their name therefore its c.
Pourquoi Pierre a tort?
Pierre a tort parce que Anne n'a pas d'examen de français mais elle en a un de sciences.
OR
Pierre a tort parce que Anne a un examen de sciences et non de français.