Question

select the circuit that contains the double - pole single - throw switch.

Explanation:

A double - pole single - throw (DPST) switch has two poles (separate electrical connections) and can be thrown to one of two positions to open or close the circuit for both poles simultaneously. In the top - most circuit, the switch has two poles and can be toggled to connect or disconnect two separate parts of the circuit simultaneously. The middle circuit has a single - pole switch and the bottom circuit also has a single - pole switch.

Answer:

The top - most circuit.