Porter is studying the influenza pandemic of World War I. He is examining letters, journal entries, autobiographies, and newspaper articles from that time to see how fear of the disease affected the daily life of millions of people throughout Europe during that era. Which statement describes the type of history Porter is writing?

ththis should be under spanish

the fraction 18/22 is equivalent to 9/11.

in decimal form if needed

this is a proper fraction once the absolute value of the top number or numerator (18) is smaller than the absolute value of the bottom number or denomintor (22).

the fraction 18/22 is equal to 18÷22 and can also be expressed in decimal form as 0.818182.

collect the tariff by force if necessary

use the military to enforce a federal law

b and c

because he didn't know how to do it