A conditionally stable system exhibits poor stability at

Option B is incorrect because reduced values of open-loop gain can actually improve the stability of a conditionally stable system. This is because reduced values of open-loop gain increase the phase margin and make the system less likely to become unstable.

Option C is incorrect because increased values of open-loop gain can actually worsen the stability of a conditionally stable system. This is because increased values of open-loop gain decrease the phase margin and make the system more likely to become unstable.

Option D is incorrect because a conditionally stable system can exhibit poor stability at low frequencies.