С) why could the people understand each other ? what did the people decide to build? why did they want to build the city? why did god got get angry ? how did he punish the people ?

People should be able to understand each other. Because if we do not understand each other, the whole world would roll upside down. God can't get angry at people. After all, he created them. There are no ideal people, so we can't predict the future, guess present...
Punishment gives you destiny, she's like no one else can and can foretell your future. You can change it, but to do this, you must first change ourselves.