The old man likes everything to be written in black and white.What does the underlined idiom mean?

Explanation

The correct answer is 'Clearly expressed in writing'. The idiom 'in black and white' means that something is clearly and unambiguously stated, often referring to written documents where the meaning is straightforward. The other options do not capture this meaning: 'In a newspaper' refers to a medium without implying clarity, 'In coded language' suggests complexity and obscurity, and 'In photographs' relates to visual representation rather than written clarity. Therefore, the correct understanding of the idiom is essential for selecting the right option.