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In the context of the given circuit, a voltmeter is designed to measure the potential difference (voltage) across two points in an electrical circuit. The correct answer indicates that the voltmeter reads 0 A, and this suggests that there is no voltage present across its terminals.

This situation could occur in several scenarios, such as when an open circuit is present where no current is flowing. In this case, the voltmeter effectively measures the lack of voltage difference across its connection points, which translates to a reading of 0 A. It's important to recognize that a voltmeter is not designed to measure current (in Amperes) but rather volts (potential difference). If no potential difference exists, the voltmeter reports a reading of zero.

Other choices present values that signify current (in Amperes), which are not relevant to a voltmeter's function. Therefore, a reading of 0 A indicates the absence of any measurable voltage, confirming that the conditions in the circuit support this measurement accurately.