As i mentioned earlier that yes Alaska is situated away from the main land...but i assume that the examiner was asking about the direction and not the fact that it is situated away from main land...its just like when we say that bangladesh is on the east of pakistan.. we never say or said it ever that it is away from main land.... The option of main land was just to confuse the candidates...its my logic anybody may disagree.

As far as the difference between afforestration and reforestration is concerned i know it....that is why i believe that afforestration is about planting of new trees as it is planting trees where they never existed, while reforestration is to plant trees where trees existed before....yes the option might be planting of trees....the question was confusing and i belive that planting of trees is a more rational answer..