Rank the gases A_r, N₂, CH₄, and C₂H₆ in order of increasing density at STP.

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a) CH4 < C₂H6 < N₂ < Ar b) CH4 < N₂ < Ar < C₂H6 c) Ar < C₂H6 < N₂ < CH4 d) CH4 < N₂ < C₂H6 < Ar