Given that: Praveen is younger than Sumesh and Ramesh is older than Tony. From statement I: Ramesh is older than Praveen. Ramesh > Praveen Sumesh > Paveen Ramesh > Tony Either Sumesh or Ramesh is the oldest. We cannot determine with the statement. Therefore, Statement I alone is not sufficient to answer the question. From statement II: Sumesh is older than Ramesh. Sumesh > Praveen Sumesh > Ramesh Ramesh > Tony We can conclude that the oldest one is Sumesh. Therefore, Statement II alone is sufficient to answer the question. From statement III: Tony is the youngest among all. Sumesh > Praveen Ramesh > Tony We cannot determine with the statement. Therefore, Statement III alone is not sufficient to answer the question. Hence, the statement II alone is sufficient to answer the question.