The correct option is A the coin reaches again in your hand
The coin when held in Palm, the relative motion between train and coin was zero.
when the coin was flipped, the force acting on coin through frictional force, at palm of hand, stopped working and it keeps moving with uniform speed at which it was moving horizontally at time of flip. The distance covered by coin will be same as of passenger and train as train was moving at uniform speed. Hence, the correct answer is B