The profitability of a business is reduced by anything that undermines employee morale. This is why paying senior staff with stock options, which allows them to earn more when the enterprise prospers, is not a wise policy because it increases dramatically the employees who are paid only a fixed salary.
What this question is testing
Your task
Find the assumption the argument requires in order for its conclusion to hold.
Common trap
Answers that would help the argument but aren't strictly required (sufficient, not necessary).
Winning move
Negate each choice — the right one breaks the argument when negated.
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