The correct option is D.
Marginal cost refers to the amount of money it cost a company to produce one more of a particular product while the marginal benefit refers to the benefit that is obtained as a result of producing that one extra product. Profit is maximized when the marginal cost equals the marginal benefits.
<span>This is an analogy that you need to complete in order to see what the final word should be. So, exciting is an adjective that describes the noun thrill. So, in order to finish the analogy, you need a noun that the adjective difficult refers to. That noun could be ordeal, hardship, trouble, torment, torture, etc. You need a word that means "something difficult," so any of those words could be the correct answer.</span>
Interest
Note: I am not 100%
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The answer is D. When it comes to giving people good advice, Jon is a regular Yoda. Allusion is when you say something in a passing fashion without actually making direct reference to it (a person, place, or thing.) Since you are calling Jon a 'regular Yoda' you are comparing him and making a sort of passing reference, but are not speaking directly about Yoda himself. So this is Allusion. Another example of an allusive sentence would be: When my uncle won the lottery he acted like a total Scrooge.
