Concept:
Look for repeating patterns or symmetry in the letter sequence.
Step 1:Write the pattern with blanks:
\[
\text{BR__ NB_ O_ NB}
\]
Step 2:Observe repeating structure:
\[
\text{BR __ NB _ O _ NB}
\]
Notice that:
``NB'' repeats at the end
Pattern suggests repetition of letters in alternating form
Step 3:Try option (C)} OWOW:
\[
\text{BR\underline{OW}NB\underline{O}O\underline{W}NB}
\]
This forms a consistent alternating and repeating structure.
Step 4:Other options do not maintain symmetry or repetition properly.}
Step 5:Final Answer:
\[
\text{OWOW}
\]