The correct answer is B: In parallel. A voltmeter is connected in parallel to a component to measure applied voltage. Parallel connection means the voltmeter is connected across (on both sides of) the component, allowing it to measure the voltage difference between those two points. This is different from series connection, where components are connected end-to-end. For amateur radio operators, understanding parallel connection is essential for proper voltage measurement. Connecting a voltmeter in series would break the circuit and give incorrect readings. Parallel connection doesn't affect the circuit operation significantly because voltmeters have very high input impedance.