Will upvote
which of the following would be least likely an industry in the coastal plain?
a. seafood
b. tourism
c. coal mining
d. shipbuilding

Coal Mining because there are less coal deposits by the sea and all the rest are linked to the sea

The answer is:  [C]:  coal mining .

Explanation:

     Among the answer choices giving, "coal mining, would be the LEAST likely industry to thrive—or even exist—in the Coastal Plain.  Coal mining usually occurs in the mountain ranges, where coal mines exist (such as the states in suburban Appalachia region in the United States of America).
      The other answer choices given—seafood, tourism, and shipbuilding—are much more likely to exist in the Coastal Plain (think "coastal" —by the coast/access to the coast/ocean)—than "coal mining".