Correct option is C
Option (c) is the correct meaning of the given idiom.
In black and white: Means something is written or printed, rather than spoken. (Hindi: लिखित रूप में)
Example: Make sure to get the agreement in black and white to avoid future disputes.
Other related idioms and their meanings:
·
Put pen to paper: to write something.
·
Set in stone: permanently decided.
·
On record: officially documented.