Battery is connected to an electric circuit. We don’t know what type of circuit it is. May be the battery is charging or discharging. Generally the flow of electrons is opposite to the direction of flow of positive charge. While discharging of a battery the positive charge will flows from negative terminal to positive terminal. And in charging the positive charge will flows from positive terminal to negative terminal.

Conclusion : If a battery is connected to an electric circuit the charge(positive charge) may go from positive terminal to negative terminal(in charging) or go from negative terminal to positive terminal(in discharging). So option B is correct.