Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  | Matter phase |  | Description |
| --- | --- | --- | --- |
| When matter is in the | gaseous | state, it | takes the form of the container it is in |
| When matter is in the | gaseous | state, it | has a variable volume |
| When matter is in the | liquid | state, it | has a constant volume |
| When matter is in the | liquid | state, it | takes the form of the container it is in |
| When matter is in the | solid | state, it | has a definite shape |
| When matter is in the | solid | state, it | has a constant volume |
Question:
Matter has a constant volume when it is in which state? Select the correct choice to answer the question or fill in the blank.
Choices:
(A) solid
(B) liquid
(C) gaseous
(D) frozen
Answer:
(A) solid