To find the total amount of water needed for 7 plants, each requiring 14 ounces, Noah should multiply:
\[ 7 \text{ plants} \times 14 \text{ ounces per plant} = 98 \text{ ounces}. \]
To check this with an addition equation, we would add the amount of water needed for each plant together. Thus, the correct addition equation that represents the total amount of water is:
\[ 14 + 14 + 14 + 14 + 14 + 14 + 14 = 98. \]
So, the correct response is:
14 + 14 + 14 + 14 + 14 + 14 + 14 = 98.