I think it is called a paradox. A paradox is when something seems to contradict itself, but is actually a correct statement. Think of the song "Paradox" from Pirates of Penzance, it is all about an incident that seems to be false yet is true!
Answer:
A.
I want to thank my piano teacher, Martha Rufenacht for her commitment and kindness.
I think it's c or d, because it basically tells that the statement might be true or it could be false. Also, it talks about how Barack Obama is collaborating with students all around the world.
