74.
Your Answer is
Correct Answer is J
Explanation
Item J: The golden age is a further explanation of 1880 and 1939, and it needs to be separated by a comma, so J is correct.
G/H item: between 1880 and 1939 is the time adverbial of the sentence, including Looff is the example content of artisans, double commas are required to separate from the main sentence, G/H is wrong.