Pencils 200 160 120 80 40 0 Staplers 0 1 2 3 4 5 Given the above production possibilities, which of the following statements is true? (Mark all that apply.)
a) The opportunity cost of producing one more stapler decreases as more staplers are produced.
b) The opportunity cost of producing one more pencil increases as more pencils are produced.
c) The production is operating at full efficiency when 120 pencils and 3 staplers are produced.
d) The production is operating at full efficiency when 200 pencils and 1 stapler are produced.