The correct answer is: A. two.
An alkali cell has an internal resistance of about 0.05 ohms, while a lead-acid cell has an internal resistance of about 0.15 ohms. This means that the internal resistance of an alkali cell is about two times that of a lead-acid cell.
The internal resistance of a cell is the resistance to the flow of current through the cell. It is caused by the resistance of the electrolyte, the electrodes, and the connections between the electrodes. The internal resistance of a cell is important because it affects the voltage that the cell can deliver. A cell with a high internal resistance will have a lower voltage than a cell with a low internal resistance.
The internal resistance of an alkali cell is lower than the internal resistance of a lead-acid cell because the electrolyte in an alkali cell is a better conductor of electricity than the electrolyte in a lead-acid cell. The electrodes in an alkali cell are also better conductors of electricity than the electrodes in a lead-acid cell.
The lower internal resistance of an alkali cell means that it can deliver a higher voltage than a lead-acid cell. This is why alkali cells are often used in devices that require a high voltage, such as flashlights and power tools.