A $2.0 \Omega$ Resistor Is Connected Across A $6.0 \mathrm{~V}$ Power Supply $1.0 \Omega$

A $2.0 \Omega$ resistor is connected across a $6.0 \mathrm{~V}$ power supply. An ammeter with internal resistance of $1.0 \Omega$ is used to measure the current in this circuit. What is the ammeter reading?

A) $1.0 \mathrm{~A}$
B) $2.0 \mathrm{~A}$
C) $3.0 \mathrm{~A}$
D) $4.0 \mathrm{~A}$
E) an ammeter with less resistance than the rest of the circuit will not produce a reading