Step 1: Understanding the Question:
This question asks for a word nearest in meaning (synonym) to 'COGENT'.
We need to analyze the meaning of the target word and select the option that shares the closest definitions.
Step 2: Key Approach:
Define the core attribute of the target word (rational strength) and select the word with the highest semantic overlap.
Analyze the level of clarity and strength in argumentation denoted by 'COGENT'.
Step 3: Detailed Explanation:
• Meaning of COGENT: 'Cogent' is an adjective used to describe an argument, case, or proposition that is clear, logical, and convincing.
When something is cogent, it appeals strongly to the intellect or reason.
• Option A (muddled): This means confused or disordered.
This is an antonym of 'cogent'.
• Option B (ineffective): This means not producing any significant or desired effect.
This is also an antonym of 'cogent'.
• Option C (persuasive): This means good at convincing someone to do or believe something through reasoning or the use of arguments.
A cogent argument is inherently persuasive; thus, 'persuasive' is the closest synonym.
• Option D (vague): This means of uncertain, indefinite, or unclear character or meaning.
This is another antonym of 'cogent'.
Step 4: Final Answer:
The word nearest in meaning to 'COGENT' is 'persuasive'.