Select the answer option that best fits the given sentence.
The painting had an air of ________ about it

A. mystery
B. sadness
C. joy
D. regret
The painting had an air of mystery about it.
Complete the following task based on the instruction and optional input provided.### Instruction:
Select the answer option that best fits the given sentence.

### Input:
The painting had an air of ________ about it

A. mystery
B. sadness
C. joy
D. regret

### Output:
The painting had an air of mystery about it.