What best describes a "paradox"?

A paradox is best described as something that seems to contradict itself. This can refer to statements or situations that appear illogical or contrary to common sense but may nonetheless hold a deeper truth upon further reflection. A classic example of a paradox is the statement "This statement is false." At first glance, it causes confusion since if the statement is true, then it must be false, and vice versa.

The other options do not encapsulate the essence of a paradox. A situation with a clear solution does not involve contradiction; instead, it presents clarity and resolution. An agreement among all parties signifies consensus and understanding, which is also contrary to the concept of contradiction inherent in a paradox. A universally accepted truth implies a widely recognized fact, which does not contain the conflicting elements characteristic of a paradox. Thus, the defining characteristic of a paradox is the intriguing contradiction that invites deeper exploration and understanding.