Answer:
b. The net force is the same as the centripetal force.
Step-by-step explanation:
When bucket is revolving in circle of constant radius then the net force at any moment of time is always towards the center of the circle which is given as




now we have


while the weight of the sea shell is given as



so here net force is more than the weight which means it must have normal force along with the weight of sea shells at that position
so correct answer will be
b. The net force is the same as the centripetal force.