Three identical voltmeters each have a fixed resistance R which allows a small current to flow through them when they measure a potential difference in a circuit. The voltmeters, V₁, V₂, V₃ are connected in the circuit shown below. The voltage-current characteristics of the device D are unknown. If V₂ reads 2V and V₃ reads 3V, what is the reading on V₁?
[Figure: Circuit diagram showing three voltmeters V₁, V₂, V₃ connected with device D]
A. 1V
B. 2.5V
C. 3V
D. 5V