If 'S × T' means that S is the brother of T, 'S + T' means that S is the father of T, which of the following shows that 'O' is the cousin of R?
R × T + O.
R + T × O.
R × O × T.
None of these.
Testing every options for the relationship given in the question, we find that none of the option shows relationship that O is cousin of R.