The correct answer is C. Generater. The correct spelling is generator.
A. Glistening is an adjective that means shining or sparkling. It is spelled correctly. B. Genuine is an adjective that means real or true. It is spelled correctly. D. Generosity is a noun that means the quality of being kind and giving. It is spelled correctly.
The word "generater" is not a real word. It is likely a misspelling of the word "generator." A generator is a machine that converts mechanical energy into electrical energy.