Answer:
B. Increasing the production of a good requires larger and larger decreases in the production of another good.
Explanation:
Opportunity cost refers to the foregone units of production of a good in exchange for producing units of another good.
Marginal cost on the other hand refers to additional cost incurred when an additional unit is produced.
Marginal opportunity cost relates to the additional opportunity cost incurred when additional unit of second good is produced in exchange for foregoing or sacrificing units of production of first good.
Increasing marginal opportunity cost would mean as more and more units of good A are produced, for each extra unit of production of Good A, higher units of production of Good B are sacrificed i.e larger and larger decrease in the production of another good.