Answer:
(B) is a volume in space.
Explanation:
A system is the space chosen form the universe for the study and analysis.
There are 3 kinds of systems :
1) Open system:
This system can interact to surroundings in terms of both mass and energy transfer through its boundaries.
2) Closed system:
This type of system can only interact to the surrounding in terms of energy transfer through its boundary.
3) Isolated system:
This type of system cannot interact with the surrounding by any means and its energy remains constant with time under the observation.
It has insulated boundary.