What does the author mean by the phrase "build up"?

look it up...it will give u all the definitions of the word build up.

Explanation:

gradual or increases I typically of something Bad or negative and typically leading to a crisis . That is what at least in this case build up means .

the answer is c, all the other options are things they are known for.

hope this ☺️

sharing a small living space with family

members. during the industrial revolution, people from the countryside came to

cities in multitudes looking for greener pastures by obtaining jobs in

factories. for this reason, the family members had to live together in small

space