Answer:
See the explanation below.
Step-by-step explanation:
a)
In order for this circuit to work, the batteries must always have positive and negative contact. So you must reverse the location of one of the batteries so that this circuit can work.
b)
For this circuit to work, one of the wires must be connected to the positive port of the battery, the current may flow from the negative to the positive pole.
c)
For this circuit to work, the circuit must be closed completely, so that the current can flow around it and all the elements connected to the circuit will receive current.