The number of already named bones in the human skeleton is

200
206
212
218

The correct answer is B. 206.

The human skeleton is made up of 206 bones. These bones are divided into two main groups: the axial skeleton and the appendicular skeleton. The axial skeleton consists of the skull, the spine, and the rib cage. The appendicular skeleton consists of the arms, the legs, and the girdles that attach the arms and legs to the axial skeleton.

The skull is made up of 22 bones. The spine is made up of 26 bones, which are divided into 7 cervical vertebrae, 12 thoracic vertebrae, 5 lumbar vertebrae, 5 sacral vertebrae, and 4 coccygeal vertebrae. The rib cage is made up of 12 pairs of ribs.

The arms are made up of 30 bones. The legs are made up of 32 bones. The girdles that attach the arms and legs to the axial skeleton are the pectoral girdle and the pelvic girdle. The pectoral girdle is made up of two bones, the clavicles and the scapulae. The pelvic girdle is made up of two bones, the ilium, the ischium, and the pubis.

The number of bones in the human skeleton can vary slightly from person to person. For example, some people may have an extra vertebra or rib. However, the number of bones in the human skeleton is typically 206.

Option A is incorrect because it states that there are 200 bones in the human skeleton. Option C is incorrect because it states that there are 212 bones in the human skeleton. Option D is incorrect because it states that there are 218 bones in the human skeleton.