Which sentence states the central idea of the passage?
Labor Day is an important holiday that celebrates the achievements of
workers in gaining rights and improving working conditions. Many
years ago, people were forced to work in very dangerous conditions,
but now there are laws that make workplaces safer. Today, many
countries around the world recognize the importance of workers'
achievements by celebrating Labor Day with parades and other
festivities.
O A. Labor Day is important because, in the past, working conditions
were often unsafe.
O B. Labor Day is an opportunity to recognize that even though
workplace conditions have improved, more improvements still
need to be made.
O C. Labor Day is celebrated around the world to honor the importance
of workers' rights.
O D. Labor Day is an important holiday that is often celebrated with
festivities.