ก The chart shows the naval arms race in the 1910s.
Dreadnought Construction
Year
Britain
Germany
< 1910
7
7
1910
3
1
1911
5
3
1912
3
2
1913
7
3
1914
3

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.