Correct option is D
The correct one-word for the given group of words is (d) Hydroponics.
Hydroponics is the method of growing plants in a nutrient-rich water solution, without soil. (मिट्टी के बिना पानी में पौधे उगाने की विधि)
Example: Hydroponics is becoming a popular technique for indoor farming.
Meanings of the given other options:
(A) Hydrophonically: Incorrect formation (not a real word)
(B) Hydrophilia: A tendency to attract water (जल प्रेम)
(C) Hydromonics: Incorrect, not a valid term