The drawings are hard to read, but figure (a) at the top looks like it would best represent an AC generator.
In figure (a) the magnet appears to be rotating with an axis perpendicular to the windings of wire and within the field area of the coil. Magnetic lines of the magnet will be cut by the influence of the wires, and AC electricity will be produced.
In figure (b) the magnet appears to be rotating parallel to the field area of the windings so there will be no magnetic lines cut and no electricity produced.
In figure (c) the magnet appears to be rotating at an off angle to the field area of the windings so there will be magnetic lines cut intermittently and unreliably so there will be no electricity produced.
If you want a really basic instruction on AC generators and motors, this is the place: