The correct answer to this open question is the following.
Although there are no options attached we can say the following.
What this poem is trying to say is that relationships between human beings are very important in life.
Yes, the poem Any Human to Another," written by Countee Cullen, refers to the importance of interaction between people. The author refers to the way the suffering of one individual can affect the mood of another person.
After reading the poem, I could say that in some way or the other, people are connected in many forms. And the suffering of one person can affect many others.
For example, in the second stanza, Cullen writes the following:
"Your grief and mine
Must intertwine
Like sea and river
Be fused and mingle
Diverse yet single
Forever and forever."
This means that when two humans are friends, they are connected in more than evidence ways.