Question

identify the bone indicated at x
scapula
humerus
femur
ulna
radius

Explanation:

The bone marked 'X' is the long bone of the upper arm, located between the shoulder and elbow joint. Scapula is the shoulder blade, femur is the thigh bone, ulna and radius are forearm bones, which do not match the location of 'X'.

Answer:

B. Humerus