●When links are connected in such a way that 1st link is connected with the last link, such arrangement is termed as a chain, but if the motion transfer by the chain is constrained motion, then thechain is known as kinematic chain.

●A kinematic chain can also be defined as an assembly of links in which the relative motions of the link is possible and the motion of each link relative to the other is definite.

●A mechanism (linkage) is obtained if one of the links of kinematic chain is fixed to the ground.

Hence, the correct option is (B).

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