Do you agree with staying....? Makes no sense - are you asking if the person agrees with the concept of living abroad?
Do you agree about......? No, we never say "agree about".
Do you agree off......? We never say "agree off".
Do you agree in .....? We never say "agree in".
On the basis that the final three choices don't exist in English, I can only imagine that they think a) is right, but I don't agree! Gramatically it's correct, but it makes little sense.