The pharmaceutical company hired a consultant to supervise a taskforce studying lower salaries as to their effects on employees’ morale.

In the highlighted part, 'studying lower salaries as to their effects on employees' morale,' the phrase "as to their effects" has ambiguity, making "their" seem like it refers to "the company" rather than "salaries." Rewriting it as "the effects of lower salaries" makes the sentence more transparent and direct. Option A has a redundant 'what', option C also writes 'what are the effects' instead of 'effects', and option D inverses the relationship.