Step 1: Understanding the Concept:
Pairing each vocabulary word in List I with its precise synonym in List II.
Step 2: Detailed Explanation:
Matching word meanings:
1. Voracious (A): Excessively eager or insatiable in appetite $\to$ Ravenous (IV).
2. Abortive (B): Failing to produce the intended result, unsuccessful $\to$ Unsuccessful (I).
3. Tenacious (C): Tending to keep a firm hold, persistent $\to$ Holding fast (II).
4. Tentative (D): Not certain or fixed, done as a trial $\to$ Experimental (III).
Step 3: Final Answer:
Matching summary: A $\to$ IV, B $\to$ I, C $\to$ II, D $\to$ III.