Which of the following galaxies is a result of a merger of two or three galaxies?

NGC 2623 is classified as a result of the merger of two or three galaxies. This galaxy is particularly interesting because it exhibits features typical of interacting galaxies, such as tidal tails and a disturbed morphology, which are often the consequences of such mergers. The presence of these features indicates that the gravitational forces from the merging galaxies are influencing each other's structures, leading to the unique characteristics of NGC 2623, including enhanced star formation activity.

In contrast, NGC 1068 is a well-known Seyfert galaxy with a notable active galactic nucleus but does not display clear signs of a recent merger. Centaurus A, while a peculiar galaxy, is primarily characterized by its active nucleus and is not definitively cited as a merger of galaxies in the same manner as NGC 2623. MACSJ0717.5+3745 is a massive galaxy cluster that primarily contains many galaxies and demonstrates gravitational lensing effects, but again, it does not represent a specific merger of two or three galaxies. Each of these alternatives is significant in its own right but does not illustrate the merging process in the same way that NGC 2623 does.