During the Second Industrial Revolution, the option that decreased is:
d) domestic travel
The Second Industrial Revolution, which took place from the mid-19th to early 20th centuries, was characterized by advancements in technology, transportation, and industrial production. As a result of these advancements, domestic travel became more accessible and convenient. The introduction of railroads and steamships, for example, facilitated faster and more efficient travel within countries. Therefore, domestic travel did not decrease but rather increased during this period.