Statement: C < R ≤ Q ≥ N < S. Conclusions: I. R < N II. R ≥ N. Which conclusion(s) definitely follow?

The correct answer is C. Either I or II is true

From the chain, R vs N: the relation cannot be determined, so conclusion I is not definitely true. R vs N: the relation cannot be determined, so conclusion II is not definitely true. The two conclusions are about the same pair and together cover every possibility, so either I or II must be true.