Answer:
Neither energy nor matter
Step-by-step explanation:
A system is defined as the part of the universe. In thermodynamics, systems are of three types i.e.
1. Open System : In an open system, both energy and matter can freely exchange with surrounding. For example- boiling water in an open pan transfers both energy and matter.
2. Closed system : In a closed system, only energy is exchanged with the surrounding. For example- boiling water with a lid on the pan exchanges only energy with the surrounding.
3. Isolated system : In an isolated system, neither energy nor matter exchanges with the surrounding. For example : a thermos flask does not exchange energy and matter with the surrounding.
Hence, the correct option is (a) " neither energy nor matter ".