Correct option is A
Option (a) is the correct meaning of the given idiom.
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In black and white: Means something
clearly written or documented. (लिखित रूप में)
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Example: Before signing any deal, I need everything
in black and white.
Other related idioms:
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See eye to eye → To agree completely.
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Read between the lines → To understand hidden meanings.
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Hit the nail on the head → To describe exactly what is causing a situation.