Discussion
While taking a close-up photograph of the subject at crime scene, flash attachment is covered with a tissue/handkerchief to prevent :
Answer: A
The tissue over the flash is meant to prevent the washing-out effect.
In close-up photography a flash at short distance gives far too much light, overexposing the subject so that fine detail, for example in a fingerprint, tool mark or small wound, is washed out to white. Covering the flash with a layer of tissue or a handkerchief diffuses and reduces the light, giving a softer, even exposure that keeps the detail.
Shadows are controlled mainly by the angle of the light (oblique lighting is used deliberately to create them for impressions), bouncing is a separate technique of reflecting flash off a surface, and glare from shiny surfaces is handled by changing the angle or using polarising filters.
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