Correct Option: C

The electrodes of the cells in a storage battery consist of lead grids. The openings of the anodic grid is filled with spongy (porous) lead. The openings of the cathodic grid is filled with lead dioxide (PbO₂). Dilute sulfuric acid (H₂SO₄) serves as the electrolyte.Lead-acid batteries, also known as lead storage batteries, can store a lot of charge and provide high current for short periods of time.