At 13 months Jose has just begun walking. His father motions toward a ball and says to him, "Go get the blue ball. Yes, the blue ball. See it? Go get the blue ball." This is an example of:

- Parentese.

Explanation:

Parentese is described as the technical term for a baby talk in which the parents or an adult talks to a child in a high-pitched voice with musical prosody.

As per the question, the constant repetition('get the blue ball, yes, the blue ball') in an exaggerated manner by Jose's father exemplify 'parentese' where Jose's father is interacting with his child in a musical and high-pitched tone. Such a talk employs exaggerated facial expression and continuous repetition that assists the child to interact and learn a specific language.

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer