I'm pretty sure it is Theme.
Theme is the central topic of the text. passage, story, or anything else. So it may possibly also be the same for the underlying meaning and universal truth...but again, I am not sure.
There are different evaluative questions that we can ask to that excerpt. But, one crucial point must bind these questions. The questions have to be personal. One example could be:
According to the excerpt, do you think Mr. Yallow has to be held responsible for the actions of Graciella?
Answer:
Flower
Explanation:
A tulip is a type of flower. Hope this helped.