Using ohms law, we can say that Voltage is equivalent to Current times Resistance. We are given the voltage and the resistance of the circuit, so we simply need to find the current.
V = IR
Solve for I, where V = 2volts and R = 3ohms.
V = IR
V * 1/R = I * R * 1/R
I = V/R
I = 2/3 Amps
Hence, we should choose option A, 0.66 Amps for the current in this simple circuit.