The correct answer is C. Fulfill.
The word "fulfill" means to carry out or complete something that has been promised or expected. It is derived from the Old English word "fullfyllan," which means "to make full."
The other options are incorrect because they are not the standard spelling of the word. "Fullfil" is a common misspelling, but it is not the correct spelling. "Fulfil" is also a common misspelling, but it is not the correct spelling. "Fullfill" is the only option that is spelled correctly.
Here are some examples of how the word "fulfill" is used in a sentence:
- I have fulfilled my promise to help you.
- The company has fulfilled its obligation to its employees.
- The students have fulfilled the requirements for graduation.
