Option 1: Supplementary grants - Supplementary grants are additional funds allocated for unforeseen or new expenses that arise during the financial year after the budget has been passed. These grants are not related to the advance grants made by the House of People.

Option 2: Special grants - Special grants are additional funds allocated for specific purposes such as emergency situations or developmental projects. They are not directly related to the advance grants made by the House of People.

Option 3: Vote on credit - Vote on credit refers to a provision that allows the government to make payments for expenses without having specific budgetary allocations. This is different from the advance grants made by the House of People.

Option 4: Vote on account - This is the correct answer. Vote on account refers to the advance grants made by the House of People in respect to the estimated expenditure for a part of the ensuing financial year, pending the regular passage of the budget. It allows the government to meet its expenses until a full budget is passed.

In conclusion, the correct answer is option 4 - Vote on account, as it accurately describes the advance grants made by the House of People for the estimated expenditure in a part of the upcoming financial year.