Consider the spring-mass system, with the mass submerged in water as shown in the figure

Question :- Consider the spring-mass system, with the mass submerged in water as shown in the figure. If mass is released with spring at natural length, then momentum-position diagram for one cycle of this system is (take down direction negative) (given density of mass is more than density of water).

Solution :- 

The correct option is b

Explanation :- Initially block moves downward and its momentum increases (with –ve sign) Due to water resistance damping of motion happened.