The correct option is B spiral
According to Ruther ford's atomic theory, the electrons revolve around the nucleus in circular paths. But The revolution of the electron in a circular orbit is not expected to be stable. Any particle in a circular orbit would undergo acceleration. During acceleration, charged particles would radiate energy. Thus, the revolving electron would lose energy due to which the radius of revolutions will go on decreasing until it finally falls into the nucleus. The path the electron takes will be spiral and not circular.