Which development would best serve as a turning point between two historical periods? a. a historian discovers artifacts that offer new information about a historical figure b. a country's leader hosts a conference to discuss changing international trade agreements c. an inventor creates a new technology that revolutionizes an important industry d. a business publishes a report describing its efforts to reduce its environmental impact

C. An inventor creates a new technology that revolutionizes an important industry

Explanation:

The letter C shows a turning point between two historical periods. That's because when a new technology that revolutionizes an important industry is created, it creates a turning point between a period with less technology and a period with more technology. This new technology begins a new historical period.

this isn't a question and if you're going to list things be kind and use commas.