When is it appropriate to use a colon over other forms of punctuation a. separate certain numbers b. to define a clause c. to announce a quotation d. to introduce a list

D    
In literature, a colon (:) is defined as a punctuation mark indicating that a writer is introducing a quotation or a list of items, or that a writer is separating two clauses of which the second expands or illustrates the first. Additionally, colons indicate a statement of proportion between two numbers: a ratio of 10:1, the separation of hours from minutes (and minutes from seconds) in a statement of time given in numbers: 4:30 p.m, or the number of the chapter and verse respectively in biblical references: Exodus 3:2.

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