To verify Ohm's law, a student connects the voltmeter across the battery as, shown in the figure. The measured voltage is plotted as a function of the current, and the following graph is obtained:If Vo is almost zero, identify the correct statement:

• A. The emf of the battery is 1.5 V and its internal resistance is 1.5 Ω
• B. The value of the resistance R is 1.5 Ω
• C. The potential difference across the battery is 1.5 V when it sends a current of 1000 mA
• D. The emf of the battery is 1.5 V and the value of R is 1.5 Ω