In general when they need to get done with their basic requirements or their needs they fight for that if the authority didn't respond proply..
sequence like salary incresment.
then the Labour union strikes to win their requirement.
Light bulbs were the power source used in factories during the industrialization
The answer is letter B. They used education and humanist ideas. This is how the Jesuits set out to spread the Catholic faith around the world. They established schools in Spain, France, South America and other selected countries.