I say D is the correct answer
CAN YOU GIVE THE BRAINLIEST
The event that set off World War I was the assassination of Archduke Franz Ferdinand of the Austro-Hungarian Empire and his wife Sophie by Gavrilo Princip, a Serbian nationalist, on June 28, 1914 in Sarajevo.
<span>Reporting on military setbacks contributed to public disillusionment with the war. (qizizz.com)</span>
Answer:
Development of the assembly-line
Explanation:
Ford is known for being the first person to begin to make cars on an assembly-line thus increasing productivity and profits.