What is the total voltage of two normal 12V batteries connected in parallel?

When two 12V batteries are connected in parallel, they maintain the same voltage as a single battery, which is 12 volts. In a parallel configuration, the voltage across all connected batteries remains constant while the capacity (in terms of amp-hours) increases. This means that while you can draw more current from the parallel setup, the overall voltage is not additive as it is with series connections. Therefore, the total voltage remains at 12V, which is why this choice is the correct answer.