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Ammeter is always connected in series with a circuit that the current to be measured. If ammeter has a large resistance, the net resistance will be high. It will effect the total measures of circuit. Then we can’t get the accurate values of the current drawn from the voltage source. If the ammeter have a small resistance, it will not show an appreciable change in net resistance.
Voltmeter is always connected in parallel with the element to measure the voltage across the element. Voltmeter should have a large resistance. If voltmeter have small resistance, definitely draw the current from the source. It is not supposed to draw any current from the source. It has to measure the potential difference across the element only.
An ammeter should have small resistance and a voltmeter should have large resistance. Option A, D are correct.
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