Africa is the only continent that is crossed by what 3 important parts?

Africa Lies in all 4 hemispheres and the only continent that its land is crossed by the Prime Meridian and the Equator

Explanation:

The labor movements began at the beginning period of the Industrial Revolution, which was a time in which many business owners treated skilled workers unfairly. Because of this, those workers were inclined to form a union in order to achieve more stability and better working conditions. 

The answer is the first option: They had successfully organized skilled workers into unions.