Which of the following is a marked breed of rabbit?

The Californian breed of rabbit is classified as a marked breed because of its distinctive color pattern. Marked breeds possess specific colorations and markings that highlight certain features, such as the presence of a white body with dark markings on the ears, nose, feet, and tail in the case of the Californian. This unique pattern is a hallmark of the breed and is one of the criteria used in judging them in shows.

In contrast, other breeds like the Mini Rex and Holland Lop are considered solid or self-colored breeds, lacking the defined markings that categorize a marked breed. The English Angora, while having a unique and distinct coat, does not fall under the category of marked breeds due to its uniform appearance across its fur. Thus, the Californian breed stands out as the correct answer due to its specific marked characteristics.