Logical Deduction

We can determine who owns the most land by combining the given statements to form a single ranking from highest to lowest.

1. 
   The first statement gives us a partial order: Prem > Raju > Sundar.
   


2. 
   The second statement tells us Yash has the least, placing him at the very bottom of the ranking.
   


3. 
   The third statement says Sundar > Hari. We can insert Hari into our ranking from the first step.
   

Final Ranking

Combining all the pieces of information gives us the complete order of land ownership from most to least:

Prem > Raju > Sundar > Hari > Yash

From this complete order, it is clear that Prem owns the highest share of land.

Final Answer: The correct option is B. Prem.