Introduction:
Sikander Lodi was the ruler of the Delhi Sultanate from 1489 to 1517. During his reign, he launched several military campaigns to expand his empire. One such campaign was the attack on Bengal, which took place during the reign of Husain Shah, making option D the correct answer.

Reasons for Sikander Lodi's Attack on Bengal:
There were several factors that led Sikander Lodi to launch an attack on Bengal:

1. Geographical Proximity:
Bengal was a neighboring region to the Delhi Sultanate, and its strategic location made it an attractive target for Sikander Lodi's expansionist ambitions.

2. Economic Importance:
Bengal was known for its prosperous trade and commerce. It had a well-developed agricultural sector, which produced high-quality rice, jute, and other goods. By capturing Bengal, Sikander Lodi aimed to gain control over its valuable resources and increase his empire's economic prosperity.

3. Political Instability:
During the reign of Husain Shah, Bengal was facing internal conflicts and political instability. Sikander Lodi saw this as an opportunity to exploit the weakness of the Bengal Sultanate and establish his dominance in the region.

The Attack on Bengal:
Sikander Lodi launched a military campaign against Bengal during the reign of Husain Shah. The exact year of the attack is not specified, but it occurred during Sikander Lodi's reign, which began in 1489.

Results of the Attack:
Sikander Lodi's attack on Bengal was successful, and he was able to capture significant territories in the region. He appointed his trusted generals and administrators to govern these territories and ensure his control over Bengal.

Conclusion:
Sikander Lodi's attack on Bengal took place during the reign of Husain Shah. The reasons for this attack included the geographical proximity of Bengal, its economic importance, and the political instability in the region. Sikander Lodi's successful campaign resulted in the expansion of his empire and the establishment of his rule in Bengal.