The question refers to the literary research of Mahmood Shirani and asks which poet he declared as the first 'Sahib-e-Diwan' poet of Urdu. A 'Sahib-e-Diwan' poet is one who has a complete collection (Diwan) of their poetry compiled.
The correct answer is B: مسعود سعد سلمان (Masood Saad Salman). Mahmood Shirani, a distinguished researcher and literary critic, conducted extensive studies on the origins and early development of Urdu poetry. His groundbreaking research led him to conclude that Masood Saad Salman, a Persian poet from the Ghaznavid period (11th-12th century) who also composed verses in Hindvi (an early form of Urdu), was the first poet to have a 'Diwan' in this language. Shirani's findings challenged earlier assumptions and significantly contributed to the understanding of Urdu's literary history.
The distractors are incorrect: A: امیر خسرو (Amir Khusro) is often considered a pioneer of Hindvi poetry, but Shirani's specific claim for 'Sahib-e-Diwan' status predates him. C: قطب شاہ (Quli Qutb Shah) is recognized as the first 'Sahib-e-Diwan' poet of Urdu from the Deccan region, but Masood Saad Salman's claim, according to Shirani, is chronologically earlier in the broader context of Urdu's evolution.