Why Should You Keep The Use Of Flash To A Minimum? A. Flash Photos Have Harsh Shadows. B. Flash Photos Are Dimly Lit. C. Flash Causes Red-eye On Photo Subjects.

You never know, which is why. There is a subtle but important difference between the use of that and which in a. Its distribution is very limited -- it can only have the word reason as its antecedent, and since it's never the subject it's always deletable..

Only have similar answers where the reason for something is the cause. Where does the use of “why” The grass is wet because it rained last night.