more then enough

[Tukanja]

He wrote a _______________________________ message.

a) two hundred words
b) two-hundred-words
c) two hundred word
d) two-hundred-word
e) two hundred word's
f) two hundred's word
g) two hundred's word's

anyone to let me know the right form?

[Cypress]

d) is the correct answer: He wrote a two-hundred-word message.

Here "two-hundred-word" works like a single adjective, so it has to be hyphenated. Other examples: five-year-old child, four-bedroom house, three-page document (note that the words year, bedroom, and page are singular).