Englishfor English speakers
transient
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noun
(physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load
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noun
one who stays for only a short time
transient laborers
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adjective
(= transeunt)
of a mental act; causing effects outside the mind
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adjective
(= ephemeral, passing, transitory, fugacious)
lasting a very short time
the ephemeral joys of childhood
a passing fancy
youth's transient beauty
love is transitory but it is eternal
fugacious blossoms
elimination
Noun
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Elimination is the act of eliminating.
From the process of elimination, I think that the answer to your question is A.