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:
|  | ORBITAL TIME PERIOD |  | EQUIVALENT EARTH DAYS |  |
| --- | --- | --- | --- | --- |
| One | day; Earth day; day and night | is equal to | 1 day | on Earth |
| One | week; Earth week | is equal to | 7 days | on Earth |
| One | month; Earth month | is equal to | 30.44 days | on Earth |
| One | year; Earth year | is equal to | 365.24 days | on Earth |
| One | Moon year; lunar year | is equal to | 29.5 days | on Earth |
| One | Moon day; lunar day | is equal to | 29.5 days | on Earth |
Question:
Which of these is equal to 7 days on Earth? Select the correct choice to answer the question or fill in the blank.
Choices:
(A) Moon year
(B) month
(C) year
(D) week
Answer:
(D) week