How could conflict or tension indicate the article's focus for explaining why countries joined the war?

valentina tereshkova

soviet cosmonaut valentina tereshkova became the first woman to fly to space when she launched on the vostok 6 mission june 16, 1963. valentina tereshkova was the first woman to go into space. in 1963, she spent almost three days in space and orbited earth 48 times in her space capsule, vostok 6.jan 22, 2018

i believe it is the second one.   if correct plz mark brainliest.

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.

it made them more prductive and efficent but with the change of polcies less and les got into the navy