Which sentence is written in passive voice?
a. leonardo da vinci painted the mona lisa.
b. ronald reagan was elected president of the united states in 1980.
c. people found traces of the oil spill as far away as newfoundland.
d. thomas jefferson, who later became president of the united states, wrote the declaration of independence.?

theres no poem plesae include that

two factors or characteristics of a chapter that might make it difficult to read would be words i don't understand, or if i don't fully understand what's going on in the chapter. strategies i can use to get through the difficult material would be a dictionary, and re-reading previous chapters to get a better grasp of what the author is trying to say.