Step 1: Define relations of production (Marx).
They are the {social relations} governing production—{ownership/control} of the means of production and the {organizational relations} among producers (who commands whom, how tasks are divided, how surplus is appropriated).
Step 2: Test the options
(A) Labour: a {force of production} (productive input), not a relation $\Rightarrow$ No.
(B) Division of labour: an organizational {social relation} structuring roles and control in production $\Rightarrow$ Yes.
(C) Property relations: ownership/tenure rules over means of production—core to relations of production $\Rightarrow$ Yes.
(D) Capitalism: a {mode of production} (system combining forces and relations), not itself a specific relation $\Rightarrow$ No.
Final Answer: (B), (C).