Unreal
Mythical
Short-lived
Artificial
Answer is Wrong!
Answer is Right!
The correct answer is C. Short-lived.
An ephemeral thing is one that lasts for a very short time. It can be used to describe anything from a flower that blooms for a day to a trend that is popular for a few months. Ephemeral things are often beautiful and fleeting, and they can be a source of joy and wonder. However, they can also be frustrating and fleeting, and they can be a reminder of the impermanence of all things.
The other options are not synonyms of ephemeral. Unreal means not real or not true. Mythical means existing only in myths or legends. Artificial means made by humans rather than occurring naturally.