One-year old matthew wanders into the kitchen where his father is making dinner for the family. he points to the counter and says, "nana! " his father looks down and says, "do you want to eat a banana? " matthew then gets very excited and starts jumping up and down. matthew is currently in the stage of language development.

The correct answer is the one-word stage of language development.

The one-word stage of development is typically seen in toddlers, wherein toddlers tend to speak and communicate through the use of one-word speeches, such as in the given situation, wherein Matthew asked for a banana from his dad, instead of using the word "banana" he used "nana".