The correct option is A Sesamoid
A flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.is called a tendon.
Bone formed by ossification of the tendon is called as the sesamoid bone.
Sesamoids are found in several joints in the body. In the normal foot, the sesamoids are two pea-shaped bones located in the ball of the foot, beneath the big toe joint. Their functions of sesamoid bone include modify pressure, to diminish friction, and occasionally to alter the direction of a muscle pull. So, the correct answer is 'Sesamoid bone'.