Can we say "three-year" instead of saying "three years"?

The phrase #1 is grammatically incorrrect because when you use the word "old" to refer to the age of a person or thing, it's a postpositive adjective. ... When you combine the words in the phrase "three years old" by hyphenating them to make it an adjective or a noun, you must use the singular noun (year).

the correct answer is option d. the nature of democracy. on november 19, 1863, president abraham lincoln delivered his famous gettysburg address in gettysburg, pennsylvania. in his speech, rather than focusing on details of the war (soldiers, casualties, aftermath of battle), lincoln invoked the very nature of democracy, that power ultimately comes from the people, when stating, “government of the people, by the people, for the people shall not perish”. these words mean that democracy is a government by the people (citizens) in which the supreme power is vested in the people and exercised directly by the people or by their elected representatives for the benefit of all citizens. the survival of democracy in the united states is one of the reasons why this speech so significant today.