it has to be d because the occupation zones is the only thing that slowed Germany down
Voyager 2
On November 5, 2018, Voyager 2 officially left the solar system as it crossed the heliopause, the boundary that marks the end of the heliosphere and the beginning of interstellar space.
The type of research method which the researcher is using is known as:
<h3>What is Research?</h3>
This refers to the systematic study of a phenomena so as to understand the why, where and how and how to possibly replicate the situation with the aid of scientific method.
With this in mind, we can see that the said researcher who is observing young children playing without obstructing or intervening is making use of the research method known as naturalistic observation.
Read more about research here:
brainly.com/question/968894
Answer: The answer is D
D because they had many scarce materials so they had to shift the process to war needs.