In the book inside out and back again whats Ha's dynamic character

Dynamic Character: a character who changes or grows over time and has a complex

is this what you are looking for ?

even though there may be variations in human emotions over time, the poem “ a contribution to statistics” by wislawa symborska suggests that the only unchangeable characteristic is mortality.

the author poses a distinction between the approximate and non-approximate numbers which correspond to our need for certainty in life and the difficulty of achieving it. our efforts to measure the exact often fail because the world is not always clearly structured .the poem seems to imply   that the only thing that is certain and has an exact number is death.  

i believe it is b, but i could be wrong. im pretty sure im right tho. ; )