Concept:The word "ephemeral" means lasting for a very short time. Its opposite must mean lasting forever or for a long time.
Explanation:The sentence says social media trends are ephemeral, i.e., short-lived.
Check the meanings of the given options:
Option A "everlasting" means lasting forever, which is the opposite of ephemeral.
Option B "evanescent" means quickly fading.
Option C "transient" means lasting only for a short time.
Option D "fleeting" also means lasting for a very short time.
Since options B, C, and D are similar in meaning to "ephemeral," they cannot be the correct answer.
Therefore, the word opposite in meaning to "ephemeral" is "everlasting."
Answer:A. everlasting