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:
| Resource for humans | Natural or artificial |
| --- | --- |
| water | natural |
| houses | artificial |
| electricity | artificial |
| roads | artificial |
Question:
Roads are _______ resource for humans. Select the correct choice to answer the question or fill in the blank.
Choices:
(A) an artificial
(B) a natural
(C) an inexpensive
(D) a terrible
Answer:
(A) an artificial