Although he has failed in the written examnation, he is using "backstairs influence" to get the job
Although he has failed in the written examnation, he is using "backstairs influence" to get the job Correct Answer Secret and unfair influence
Back stairs অর্থ - গোপন ও অন্যায্য অর্থাৎ secret and unfair তাই সঠিক উত্তর (ঘ)।