Answer: Option (b) is the correct answer.
Step-by-step explanation:
The symbol made of two long lines and two short lines with a positive and a negative sign at each end represents a battery which is a source of electrical energy.
The positive end represents high potential whereas negative end represents low potential. So, current will flow from higher potential to lower potential, that is, from positive end to negative end.
Thus, we can conclude that in the circuit diagram, the symbol made of two long lines and two short lines with a positive and a negative sign at each end represent a source of electrical energy.