What is the significance of spanish flu

In 1918, a new influenza virus emerged to cause a pandemic that in a two-year period about 500 million people or one-third of the world's population became infected with this virus and at least 50 million people worldwide died the greatest influenza mortality in recorded history

Explanation:

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first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.

i believe your answer is d)