Concept:The extreme left end cannot be found unless the complete order of all four people is fixed.
Explanation:From Statement I, Nitin is immediately right of Mehul. This gives the pair
Mehul−Nitin.
The positions of Prakash and Sandeep are unknown, so Statement I alone is not sufficient.
From Statement II, Prakash is immediately left of Sandeep. This gives the pair
Prakash−Sandeep.
The positions of Mehul and Nitin are unknown, so Statement II alone is not sufficient.
Combining both statements, we get two adjacent pairs:
Mehul−Nitin and
Prakash−Sandeep.
Two possible arrangements are:
Mehul−Nitin−Prakash−Sandeep, where the extreme left is Mehul.
Prakash−Sandeep−Mehul−Nitin, where the extreme left is Prakash.
Since both arrangements are possible, the extreme left person cannot be uniquely determined.
Answer:Data in both statements I and II together are NOT sufficient to answer the question.
So, the correct answer is Option C.