What is the common factor among these corporations? -coca - color - home depot -delta airlines -georgia pacific

Allow me to give you a brief answer here, and then also refer you to a related answer I posted to a similar question elsewhere.

All four of the major corporations named in your question have their roots in the state of Georgia, and their headquarters are in Atlanta.

John Pemberton invented Coca-Cola.  B.R. Coad and C.E. Woolman founded Delta.  Arthur Blank and Bernie Marcus founded the Home Depot. Owen Roberson Cheatham founded the Georgia-Pacific paper company.
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Ithink it’s c , good luck on whatever : )