In the 1920s did the auto industry grow rapidly?

The correct answer is C. Primary Sources

Explanation:

Sources can be mainly primary or secondary. Primary sources are first-hand accounts of an issue, topic or event, this implies primary sources are written or created by someone who experiences or witnessed an event and created a source based on this experience during the event or little  time after this ended, primary sources include any type of sources such as photographies, written documents or artifacts. On the other hand, a secondary source is a source that analyses, summarizes or discusses other primary sources. Considering this the transcripts of speeches by powerful leaders are primary sources because these are first-hand accounts of an issue as transcripts are the words said by the leaders in written form and do not summarize or analyze other sources as secondary sources but are direct evidence of the events or age in which they occurred.