Option 1 -> Eternal means lasting forever or permanent, which is the opposite of evanescent.
Option 2 -> Resilient means able to recover quickly or bounce back from difficulties, unrelated to the concept of fading away.
Option 3 -> Fleeting means lasting for a very short time or passing quickly, which perfectly captures the meaning of evanescent.
Option 4 -> Practical means sensible or useful in real situations, unrelated to something that vanishes quickly.
Hence, Option 3: Fleeting -> Evanescent describes something that quickly fades, disappears, or passes out of existence, making "fleeting" (brief and transitory) the most appropriate synonym -> correct