Final answer:
When two batteries are placed in parallel in a circuit, the voltage provided by the batteries remains the same as the voltage of each individual battery, which in this case is 1.5 V per battery.
Step-by-step explanation:
When two batteries are placed in parallel in a circuit, the voltage provided by the batteries remains the same as the voltage of each individual battery. Therefore, in this case, the batteries would provide a total voltage of 1.5 V, which is the voltage of each D cell battery.