Question

which image correctly depicts how to measure current through the circuit?

Explanation:

To measure current in a circuit, an ammeter (labeled A) must be connected in series with the load (the component labeled O). This means the entire current from the battery flows through the ammeter. The first circuit shows the ammeter connected in series, forming a single continuous path for current from the battery's positive terminal, through the ammeter, through the load, and back to the negative terminal. The other two circuits connect the ammeter in parallel, which is incorrect (this would short the circuit/load and give an invalid current reading).

Answer:

The first leftmost circuit with the ammeter connected in series with the load and battery.