A spring is compressed under the action of a constant force $$F$$. The compression of the spring is $$\xi$$. Suppose the direction of the force is reversed suddenly as well as its magnitude is doubled. The maximum extension of the spring beyond its natural length will now be, assuming the spring obeys Hooke's law,

A

$$2\xi$$

B

$$3\xi$$

C

$$4\xi$$

D

$$5\xi$$