Which situation requires that you place a comma (instead of a colon) between introductory text and a direct quote? A. when the introduction is not a complete sentence
B. when the word "that" connects the introduction and the quote
C. when the upcoming quote is a block of text
D. when the upcoming quote is very long

A

Explanation:

C and d don't make sense.

B could be many things like 'that' or 'said' or 'in the words of'.  Looks like reported speech but not just for ''that'',

A - would be a short phrase and the direct speech.

In the words of Oscar Wilde, ''This wallpaper and I are fighting a duel to the death.  Either it goes or I do.''

this labor, by slow prudence to make mild.   c. ability to govern well