Answer:
The shark population will decrease. (Ans. B)
Step-by-step explanation:
If swordfish are killed by a virus in ocean biomass, the shark population will decrease because the shark consume swordfish (which are present in fourth tropical level of food chain in ocean or marine biomass) , so if there is nothing for sharks to eat they will eventually die.
Biomass is the total mass of living biological organism in an ecosystem at a given time.