One cubic foot (1 ft3 ) of seawater weighs about 64 pounds. Suppose you pour one cubic foot of seawater into a light plastic bag, tie the bag closed with no air bubbles inside, and lower it into the ocean via a light attached string. When the bag of seawater is completely submerged, how much force do you have to exert on the sting to hold it up: a. 0 lbs b. 32 lbs c. 64 lbs d. 128 lbs e. You have to push it down because it tends to come up. Please circle your answer and explain your reasoning.