Step 1: Understanding the question. 
  
The question requires us to match terms from List I (Thup I) with corresponding terms in List II (Thup II) based on their linguistic or semantic relationship. 
  
Step 2: Explanation of the matches. 
  
- (A) Sabon – Rijied: “Sabon” relates to “Rijied,” both expressing the idea of cleanliness or purification, thus forming a logical pair. 
  
- (B) Ilaka – Singmana: These two correspond semantically as they are associated with emotional or expressive attributes, showing harmony in meaning. 
  
- (C) Trei – Sailin: “Trei” means to work or act, which connects appropriately with “Sailin,” representing activity or motion. 
  
- (D) Khnong – Beng: The term “Khnong” relates to “Beng,” as both denote forms of restriction, resistance, or barrier in linguistic or metaphorical usage. 
  
Step 3: Analytical reasoning. 
  
Each pair from Thup I and Thup II matches through phonetic, semantic, or contextual correspondence, revealing deep linguistic structure within Khasi vocabulary. 
  
Such exercises test understanding of the relationship between words and their usage in syntax or semantics. 
  
Step 4: Conclusion. 
  
Hence, the correct combination is (A) - I, (B) - III, (C) - II, (D) - IV.