Step 1: Understanding the Question:
The question requires selecting the most appropriate adjective to complete the sentence meaningfully.
The key contextual clue is the phrase ``without proper planning'', which indicates a lack of structure or reason.
Step 2: Key Concepts and Vocabulary Context:
We need a word that describes an action taken randomly, impulsively, or without logical justification.
Analyzing the semantic definition of the given choices is necessary to find the perfect fit.
Step 3: Detailed Explanation:
• Option (C) - arbitrary: This adjective means based on random choice or personal whim, rather than any reason, system, or planning.
This fits perfectly with the phrase ``without proper planning''.
• Option (A) - agreeable: This means pleasant or willing to agree, which does not fit the negative context of unplanned policy changes.
• Option (B) - acceptable: This means satisfactory or tolerable, which contradicts the implication that the changes were problematic due to lack of planning.
• Option (D) - admissible: This is a legal term meaning acceptable or valid as evidence in a court of law, which is irrelevant to this general administrative context.
Step 4: Final Answer:
Therefore, the word ``arbitrary'' (Option C) is the most effective and logical fit for the blank.