The relative basic strength of the compounds is correctly shown in the option.

Step-by-step solution

The correct order of relative basic strength will be NH ₃> NH ₂- NH ₂> NH ₂- OH In NH ₃ , the lone pair is completely available for donation, hence is most basic whereas NH ₂- NH ₂ and NH ₂- OH can be considered as derivatives of NH ₃ . Here, H is replaced by - NH ₂ forming NH ₂- NH ₂ and - OH forming NH ₂- OH being highly electron withdrawing due to - O will decrease the election density most on - N . Least basic elect;on withdrawing -I -effect of - NH ₂ is less as compared to - OH . Hence correct order of basic s