Fill in the blank with the correct word from the options given below to make a meaningful sentence:-

His salary is in ______________ with the amount of work he does.

The correct option is keeping.

Detailed Explanation:
The sentence requires a word that completes the idiomatic prepositional phrase "in ________ with" to show that the subject's salary is proportionate to or consistent with the amount of work he performs.

The phrase "in keeping with" is a common English idiom that means "in agreement with," "consistent with," or "in conformity with." When used in this sentence, it indicates that the salary is appropriate and matches the amount of work done.

Let's examine why the other choices are incorrect in this context:
• accord: Although "in accord with" is a valid phrase meaning in agreement with, it is typically used for alignment with rules, decisions, or opinions (e.g., "in accord with the law") rather than comparing compensation to labor.
• coordination: The phrase "in coordination with" refers to different groups or parts working together efficiently (e.g., "operating in coordination with the local team"), which does not fit the relationship between salary and work.
• balance: While the concept of balance makes logical sense, the phrase "in balance with" is generally used to describe physical stability or ecological harmony (e.g., "in balance with nature") rather than being the standard idiomatic choice for this sentence.

Thus, keeping is the most natural and grammatically correct option.