Meaning of necessary condition – UGC NET Question

A necessary condition is one without which a particular event cannot occur. Its absence guarantees that the event will not happen. However, its presence alone may not be enough to bring about the event because other conditions might also be required. Thus the description in the stem matches the concept of a necessary condition.

Option A:
Option A, sufficient, names a condition that by itself guarantees the occurrence of the event. A sufficient condition need not be required in every case. Therefore it does not fit the idea of something that must be present but may not be enough.

Option B:
Option B correctly identifies necessary as the label for conditions that are required but not independently adequate. If the necessary condition is missing, the event cannot occur. Hence this option is the best match for the stem.

Option C:
Option C, trivial, suggests an unimportant or insignificant factor and has no precise technical meaning in logical conditional analysis. A trivial condition might be present or absent without affecting the event. Thus trivial is not appropriate here.

Option D:
Option D, accidental, refers to something happening by chance and does not capture a stable logical dependency. An accidental factor is not necessarily required whenever the event occurs. Therefore accidental condition is not what the stem describes.