The residuary powers refer to the powers and responsibilities that are not specifically assigned to any level of government in a federation. In other words, they are the powers that are not listed in the division of powers between the federal and provincial governments.

According to the Act of 1935, which established the federation, the residuary powers were conferred to the Governor General. The Governor General is the representative of the British monarch in the federation and holds certain executive and legislative powers.

Option 1, the federal legislature, is incorrect because the Act of 1935 did not confer the residuary powers to the federal legislature. The legislature is responsible for making laws and has specific powers assigned to it, but not the residuary powers.

Option 2, the provincial legislatures, is also incorrect. The Act of 1935 did not assign the residuary powers to the provincial legislatures. Like the federal legislature, the provincial legislatures have specific powers delegated to them.

Option 4, the Provincial Governors, is also incorrect. The Act of 1935 did not confer the residuary powers to the Provincial Governors. The Governors have certain executive powers in the provinces but are not responsible for the residuary powers.

In conclusion, the correct answer is option 3, Governor General.