Help please! Thank you

I think it's "Data exists to support birth order theory." Because in the first sentence we're being introduced to what researchers think about birth order, so it makes sense that the birth order theory is the next thing to be explained, in order to further the article. Not to mention, the second sentence opens with what birth order is.

i think that will have something to do with the mississippi river but google will know the full answer for sure

- "the answers are a and b.  

when cullen speaks of planting while others reap, and standing "abject and mute," he is speaking about the racial injustices present in american society. as these injustices have changed over time, the american identity  has also shifted. those changes are, in turn, reflected in american literature."