A system .

(A) is a fixed amount of matter and a control volume
(B) is a volume in space.
(C) is a volume in space and a control volume is a fixed amount of matter.
(D) and a control volume are both a fixed amount of matter.
(E) and a control volume are both a volume in space.

(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.

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