During the industrial revolution, the people who probably suffered the most were a. politicians in government b. women in fashion c. managers of businesses d. children in factories

B woman in fashion, during this workers were replaced by machines which made the work fast and produced more. 

The main cause of the Crusades was the fight between Muslims and Christians over Jerusalem.

For both religions, Jerusalem is considered the Holy Land and is very important to have control of. This is why Pope Urban II called on all Christians to help in their fight to regain this territory from the Muslims. The Crusades would end up being a series of multiple wars lasting almost 300 years.