To find out how much water Noah needed for 7 plants, he multiplied the number of plants by the amount of water each plant needed:
\(7 \times 14 = 98\) ounces of water.
To check his answer, he could use an addition equation that adds up the amount of water needed for each of the 7 plants individually.
The correct addition equation that shows this would be:
A. \(14 + 14 + 14 + 14 + 14 + 14 + 14 = 98\)
So the answer is A.