Explanation:

- Option 1: Shah Jahan

- Shah Jahan was not the successor in 1556. He became the Mughal Emperor later, from 1628 to 1658.

- Option 2: Jehangir

- Jehangir, son of Akbar, ruled after him from 1605 to 1627. He was not the successor in 1556.

- Option 3: Akbar

- Akbar, the third Mughal Emperor, succeeded the throne in 1556 at the age of 13 following his father Humayun's death. He is known for his significant contributions to culture and administration.

- Option 4: Sher Shah Suri

- Sher Shah Suri was not a Mughal but a Pashtun leader who briefly interrupted Mughal rule. He died in 1545.