Correct option is D
The logic in the given examples involves replacing each letter with a specific pattern:
In 'SIT':
'S' becomes 'RS'
'I' becomes 'HI'
'T' becomes 'ST'
Hence, 'SIT' becomes 'RSHIST'.
In 'GO':
'G' becomes 'FG'
'O' remains 'NO'
So, 'GO' becomes 'FGNO'.
In 'PEN':
'P' becomes 'OP'
'E' remains 'DE'
'N' becomes 'MN'
Thus, 'PEN' becomes 'OPDEMN'.
Applying the same pattern to 'CUP':
'C' becomes 'BC'
'U' remains 'TU'
'P' becomes 'OP'
Therefore, 'CUP' will be written as BCTUOP, which corresponds to option (d).