In what way has the development of cellular phones been characteristic of the modern era?
A. It has led to the start of the Scientific Revolution,
B. It has made the spread of cultures and ideas easier.
C. It has promoted European colonialism and imperialism.
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D. It has prevented citizens from challenging their governments.

B. It has made the spread of cultures and ideas easier.

Explanation:

in the modern era, just by using your phone you can do so many things with it! you share both your ideas and information about your culture to others, and more, such as by posting on social media or just talking/texting with someone. if cellular phones weren't around, it'd be much harder for cultures and ideas to spread.

i think it is true i hope this is

to replace ineffective because   andrew jackson's spoil system was a deliberate policy after he became president to remove federal employees he considered to be political opponents and replace them with his own supporters.