Correct Answer:
D. Illiterate
The question asks for a word describing a person unable to read or write. Understanding prefixes is key here.
- Illiterate is the correct answer. The prefix 'il-' means 'not', so 'illiterate' means 'not literate', or unable to read and write.
- Illegible (A) refers to writing that cannot be read due to poor handwriting, not the person's ability.
- Legible (B) means clear enough to be read.
- Literate (C) means able to read and write, which is the opposite of what the question describes.
Therefore, 'illiterate' accurately describes a person who cannot read or write.