In the following question, out of the four alternatives choose the word which can be substituted for the given words/sentence.
Gaseous, invisible but detectable
The correct answer is 'ethereal.' It means 'extremely delicate and light in a way that seems not to be of this world.' So option 2 is correct. $
Effervescent => vivacious and enthusiastic.$
Omnipresent => widely or constantly encountered; widespread.$
Surreal => having the qualities of surrealism; bizarre; unusual.$