Answer:
Its denotation is "personality;"; its connotation is "unavoidable."
According to the Sentence, this is TRUE that the denotation is personality and it's connotation is unavoidable.
Nature in here means like for example if you're a High Tempered person, or an "Always Sad Person", so like that nature, that's why, it's personality
Then, I don't I have that much explanation for the connotation, but it's "unavoidable".
so hence, your answer is D.
:D