The correct decreasing order of basicity of hydrides of Group 15 elements is

Question

$AsH_3 > SbH_3 > NH_3 > PH_3$

$NH_3 > PH_3 > AsH_3 > SbH_3$

$SbH_3 > AsH_3 > PH_3 > NH_3$

$PH_3 > AsH_3 > SbH_3 > NH_3$

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