AP geography, lease help WILL MARK BRAINLIEST this is a short writing.
There are disagreements today over how the Indo-European language diffused from the west and south Asia into Europe. Two naturally opposing theories attempt to explain this diffusion.

Explain and compare the Kurgan warrior theory with Renfrew’s theory in terms of geographic hearth, methods, and reasons for using the language.

The Kurgan hypothesis (also known as the Kurgan theory or Kurgan model) or Steppe theory is the most widely accepted proposal to identify the Proto-Indo-European homeland from which the Indo-European languages spread out throughout Europe and parts of Asia.

Explanation:

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.