Which of these showed the changing culture at the beginning of the 20
century?

The correct answer to this open question is the following.

What showed the changing culture at the beginning of the 20th century was the invention of labor-saving machines. These new machines were well-accepted by consumers for the amount of time they saved in daily chores. We are talking about modern inventions such as vacuums that really helped the work in the home and the office. Another great invention was the washing machine, which saved tons of time. What about refrigerators? They change the way work was done in the kitchen. Canned food also revolutionized the industry of food in America.

it should definitely consists of the total amount of the entry which hindered the diary of how most conflictions and opinions in the 1800s experiences.

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.