Arrange the following hydrides in their increasing acid strength [CH4, H2S, PH3 and SiH4] -
H2S < PH3 < SiH4 < CH4
CH4 < SiH4 < PH3 < H2S
SiH4 < CH4 < PH3 < H2S
CH4 < H2S < PH3 < SiH4
From left to right as the non-metallic character increases, the acidic character of hydrides increases.