What does blood symbolize in gothic literature?
a.
a person's repressed or hidden desires
b.
the fragility of the human condition
c.
a person's obsession with the past
d.
the complexity of the human psyche

The term blood in the Gothic literature symbolises the "complexity of the human psyche".

Explanation:

It represents the paradox of human condition. It can represent both murder and life, evil and innocence, right and wrong, just and unjust and so on. It determines the condition or the situation of what is going inside the mind of the human being and reacts in accordance with the same. The distinct identities and the states of the mind is depicted with the help of the term ‘blood’.

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a. the scene is structured as a dialogue between two characters in their own informal language.