Step 1: Understanding the Concept:
This question tests the contextual and idiomatic use of phrasal verbs. Phrasal verbs consist of a basic verb combined with a preposition or an adverb to create a new meaning that is often different from the original word's literal sense.
In a professional, financial, or accounting context, finding "discrepancies" (errors or inconsistencies) requires a specific action—correcting, resolving, or straightening them out. We need a phrasal verb that conveys "fixing minor difficulties or settling errors."
Step 2: Detailed Explanation:
Let’s analyze the meanings and nuances of all four phrasal verb choices:
1. iron out (Correct): To resolve, smooth over, or eliminate minor problems, errors, or inconsistencies. This idiom comes from the physical action of using a clothes iron to remove wrinkles. To "iron out discrepancies" in a ledger means to settle and correct the bookkeeping errors to make the record smooth and accurate for the audit.
2. clear off: This generally means to remove items from a surface (like clearing off a table) or to leave a place quickly (to "clear off" out of sight). It does not fit the context of resolving data inconsistencies.
3. gloss over: This means to deliberately ignore, conceal, or downplay a mistake or fault rather than fixing it properly. While one might try to "gloss over" errors before an audit, doing so in a ledger is fraudulent and implies deception, which doesn't fit the constructive "promised to" tone of the sentence.
4. wipe out: To completely destroy, erase, or eliminate something (e.g., wiping out a population or wiping out a debt). While discrepancies are "eliminated," "wipe out" is too extreme and usually refers to total annihilation rather than technical correction.
Step 3: Final Answer:
The correct phrasal verb to complete the sentence is "iron out" (Option a).