Concept:Conviviality means a friendly, cheerful, and sociable atmosphere.
Explanation:The word to consider is "conviviality."
It is a noun used to describe the warm and lively mood that exists when people enjoy one another's company.
A convivial person or event is welcoming, good-humoured, and full of social warmth.
Now compare the options.
Option A, spitefulness, suggests a mean or malicious attitude, so it is opposite in meaning.
Option B, conjugality, refers only to marriage or the relationship between spouses, which is unrelated.
Option D, blissfulness, means complete happiness, but it does not capture the sense of social friendliness.
Option C, friendliness, means being kind, pleasant, and sociable toward other people.
This matches the core meaning of conviviality most closely.
Therefore, the nearest in meaning is friendliness.
Answer:C. friendliness