From the premises: All daffodils $\subseteq$ plants, and all plants $\subseteq$ living things, so all daffodils $\subseteq$ living things — Conclusion I is valid. Conclusion II introduces 'flowers' which is not mentioned in any premise — invalid. Conclusion III cannot be confirmed because only 'some' living things are real, and daffodils may or may not be among them — invalid. Only Conclusion I follows.