Starting in 1954, commercial fishers in the northwest Pacific were paid by weight, rather than by the individual fish, for pink salmon. The fishers increased the use of a type of net that selectively catches larger fish. Which of the following effects did this change in fishing techniques most likely have on the salmon population over the next 20 years?
A. The average body size of the salmon population increased.
OB. The average body size of the salmon population decreased.
C. The average body size of the males in the salmon population increased and the average body size of females in the salmon population stayed the same.
OD. The average body size of the males in the salmon population stayed the same and the average body size of the females in the salmon population increased.