Option b is the correct answer. After the invasion of Timur in 1398, the Sayyid dynasty ruled over India. After the invasion of Timur in 1398, the Sayyid dynasty ruled over India. Timur's invasion led to the decline of the Tughlaq dynasty, and the subsequent weakening of the Delhi Sultanate. As a result, various regions within the sultanate, such as Gujarat, Punjab, Bengal, Awadh, and Mewat, began to declare their independence under different rulers. This fragmentation marked the transition to the Sayyid dynasty's rule. Important Tips Invasion of Timur: In 1398, Chagatai ruler Timur invaded India during the reign of Nasiruddin Mahmud. A decisive battle occurred near Delhi, leading to Timur's victory. Timur entered Delhi and carried out a massacre of the population. The invasion marked the decline and eventual end of the Tughlaq dynasty. Timurids took much wealth, including gold, to Samarkand, weakening the Delhi Sultanate. Following Timur's invasion, the sultanate fragmented as various regions declared independence. Gujarat Sultanate under Muzaffar Shah I, Khokhars in Punjab, Bengal Sultanate under Ghiyasuddin Azam Shah, Jaunpur Sultanate under Malik Sarwar in Awadh, and Mewat State under Khanzada Bahadur Khan asserted independence.