Why is a voltmeter connected in parallel across a resistor when measuring the potential difference?
(a) Because a voltmeter has low resistance and a parallel connection prevents it from affecting the circuit current.
(b) So that the same current flows through both the resistor and the voltmeter.
(c) So that it experiences the same potential difference as the resistor.
(d) Because in parallel the potential difference is shared equally between the voltmeter and the resistor.