The answer is: b. a compound that conducts electricity when dissolved in water or when molten. The compound dissociates in water into mobile ions that are responsible for the transfer of charge. These ions are either positive or negative. An example of an electrolyte is: d. sodium hydroxide (naoh), which dissociates to give sodium ions (H+) and hydroxide ions ( OH)
On the batteries that we use for example for a watch in the kitchen, occurs a chemistry reaction, called redox between Zn and MnO2. The Zn is oxidized (in the anode) and the MnO2 is reduced (in the cathode). In the oxidation, the athom loses electrons and in the reduction the opposites.
Regarding the chemical reactions that occur in the food that we consume, the hydrolisis that occurs in the stomach. The hydrochloric acid that is secreted in the stomach allows the activation of an enzyme, pepsinogen, which hydrolyzes the proteins present in the food consumed. That is, it hydrolyzes the peptide bonds of the proteins, which is between an amino and carboxyl bond of each amino acid that makes them up.