Question

Yes, the answer is A because If you are measuring any quantity in the circuit then there should not be any loss due to your instruments that you are using to measure something.

If ammeter has high resistance let's say and the circuit in which you are measuring the current has resistance then current in the circuit is

now if ammeter has resistance that is small then current

since is small we can neglect so current

so

That means for measuring current theammeter should have very small voltage so that there is no loss in the ammeter and it behaves like a short circuit.

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