The correct answer is: B. in series.
Resistance is measured in series with the component whose resistance is being measured. This is because the current through the resistor and the ammeter must be the same, and the voltage drop across the resistor is equal to the current times the resistance.
Option A is incorrect because resistance is not measured in parallel. In parallel, the current through each component is different, and the voltage drop across each component is not equal to the current times the resistance.
Option C is incorrect because resistance is not measured after breaking the circuit. The circuit must be closed in order to measure resistance.
Option D is incorrect because resistance is not measured after checking voltage. The voltage drop across a resistor is equal to the current times the resistance, but the voltage drop is not used to measure resistance.
Option E is incorrect because resistance is not measured after checking current. The current through a resistor is equal to the voltage drop across the resistor divided by the resistance, but the current is not used to measure resistance.