Statement A is correct because a solar cell acts as a power source and supplies current to a connected load. Consequently, it has a positive voltage but delivers a negative current, which places its I-V characteristics in the IV (fourth) quadrant. Statement B is incorrect because the small current (measured in $\mu\text{A}$) in a reverse-biased p-n junction diode is the reverse saturation current. This current is governed by the drift of minority charge carriers across the junction, not majority charge carriers.