Which sentence from Passage 2 contains the author's opinion?
"Each is involved in separate projects that
share a common goal: to get to the ocean's
floor first."
“The largest, in the Pacific Ocean, is larger
than the state of Texas."
“Ocean cleanup is not easy or cheap, but it is
possible.
"Currently, there are five giant islands of
garbage adrift on our oceans.”

you need need more details so we can understand what your asking us.

i've read it so how can i ?

well, number 1, the 1920s was not economically prosperous until the start of the lend-lease act, which employed large amounts of people in producing equipment for the allies.

b. world war ii is your answer, because wwi had already ended at 1918, and the cold war was after 1945.

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