If you mean like anY kind of example of flame, a lighter flame is a good example.
Anything that uses gas to emit a flame
I think the correct term to fill in the blank would be mix. A product mix is the all of the products or services lines being offered by a company. The cars, trucks, financing services and the like are all product lines that make up the product mix of Volvo.

In many companies, the chief executive officer (CEO), who holds the top management position in the company, also serves as chairman of the board. This is often the case with companies that have grown rapidly and still retain the initial founder in those roles.
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.