Select the most appropriate option to fill in the blanks.

The financial audit ______ that the firm will suffer major losses unless preventative measures are ______.

The correct answer is warns, implemented.

Step-by-Step Explanation:
1. First blank: The sentence context indicates an alert regarding potential future financial damage ("the firm will suffer major losses"). A financial audit functions to caution or alert management about such risks. Therefore, the verb warns logically fits the first blank.
2. Second blank: The condition "unless preventative measures are ______" refers to actions needed to avoid the losses. To prevent damage, actions must be put into practice or executed. The verb implemented means to put a decision, plan, or measure into effect, which completes the sentence correctly.
3. Complete sentence: "The financial audit warns that the firm will suffer major losses unless preventative measures are implemented."

Analysis of incorrect options:
- assumes, exuberant: "Exuberant" (meaning filled with energy or excitement) does not make sense when applied to preventative measures.
- promises, overlooked: Overlooking preventative measures would lead to losses rather than preventing them.
- ignores, avoided: An audit ignoring potential losses contradicts its primary function, and avoiding preventative measures is counterproductive.
- guarantees, discarded: Discarding measures would cause losses rather than stop them.