The Governor General, who partitioned Bengal was

Concept: British Viceroys/Governors-General periodically reorganised provincial boundaries; the 1905 reorganisation of Bengal is remembered as a deliberate "divide and rule" measure that split a large, administratively unwieldy province along religious lines to weaken the growing nationalist movement centred there.

Application: Lord Curzon, who served as Viceroy and Governor-General of India from 1899 to 1905, ordered this reorganisation in 1905, splitting Bengal into Eastern Bengal and Assam (a Muslim-majority unit) and a residual Bengal (a Hindu-majority unit). The stated reason was administrative convenience, but the move provoked the Swadeshi movement and is remembered as one of the most controversial acts of his tenure.

Cross-check by elimination: None of the other listed Viceroys held office in 1905 or is associated with this act:

• Minto succeeded to the viceroyalty after 1905 and is chiefly remembered for the Morley-Minto Reforms of 1909, not for redrawing provincial boundaries.

• Canning was India's first Viceroy, from 1858, occupied with restoring administration after the 1857 revolt — nearly half a century earlier.

• Mayo's tenure (1869-1872) is remembered for introducing financial decentralisation between the central and provincial governments, an unrelated administrative reform.