The table shows Robinson Crusoe's production possibilities. 
 If Crusoe increases production of berries from 84.0 pounds to 104.0 pounds and production is efficient, his opportunity cost of producing 1 pound of berries is 1.3 pound of fish.
 Crusoe's opportunity cost of producing an extra pound of berries____as he produces more berries 
 A. increases.
 B. decreases.
 C. sometimes increases and sometimes decreases.
 D. does not change.
 Possibility Berries (pounds) Fish (pounds) 
 A 0 144.0
 B 16.0 140.0 
 C 30.0 132.0
 D 42.0 120.0
 E 52.0 104.0 
 F 84.0 84.0 
 G 60.0 60.0
 H 66.0 32.0
 I 70.0 0