The number of bones in an adult human being is 206.

Explanation:
There are several different types of bones in the human body, and they all come together to form the skeletal system. The skeletal system provides support, protection, and movement for the body. It is important to have a clear understanding of the number of bones in an adult human being.

Types of Bones:
1. Axial Skeleton: This includes the bones in the skull, vertebral column, and rib cage.
2. Appendicular Skeleton: This includes the bones in the upper and lower limbs, as well as the shoulder and pelvic girdles.

Counting the Bones:
To determine the number of bones in an adult human being, we need to count each bone individually. Here are some key points to consider:

1. Skull: The skull consists of 22 bones, including the cranial bones and facial bones.
2. Vertebral Column: The vertebral column is made up of 26 bones, including the cervical (7), thoracic (12), and lumbar (5) vertebrae, as well as the sacrum (5 fused vertebrae) and coccyx (4 fused vertebrae).
3. Rib Cage: The rib cage consists of 24 ribs, with 12 pairs of ribs attached to the thoracic vertebrae at the back and the sternum at the front.
4. Shoulder Girdle: The shoulder girdle is formed by the clavicle (collarbone) and scapula (shoulder blade) on each side, totaling 4 bones.
5. Upper Limbs: Each upper limb consists of 30 bones, including the humerus (upper arm bone), radius and ulna (forearm bones), carpals (wrist bones), metacarpals (palm bones), and phalanges (finger bones).
6. Pelvic Girdle: The pelvic girdle consists of 2 hip bones (os coxae), each formed by the fusion of the ilium, ischium, and pubis.
7. Lower Limbs: Each lower limb consists of 30 bones, including the femur (thigh bone), patella (kneecap), tibia and fibula (lower leg bones), tarsals (ankle bones), metatarsals (foot bones), and phalanges (toe bones).

When we add up all the bones mentioned above, we get a total of 206 bones in an adult human being.

Therefore, the correct answer is option B: 206.