The open circuit voltage of any storage cell depends wholly upon

The correct answer is D. all above.

The open circuit voltage of a storage cell depends on the following factors:

• The chemical constituents of the cell. The type of electrodes and electrolyte used in a cell will determine its open circuit voltage. For example, a lead-acid battery has an open circuit voltage of 2.1 volts, while a lithium-ion battery has an open circuit voltage of 3.6 volts.
• The strength of the electrolyte. The concentration of the electrolyte in a cell will affect its open circuit voltage. A more concentrated electrolyte will result in a higher open circuit voltage.
• The temperature of the cell. The temperature of a cell will affect its open circuit voltage. A higher temperature will result in a higher open circuit voltage.

The open circuit voltage of a storage cell is an important parameter that is used to determine its performance. A higher open circuit voltage indicates a more efficient cell.