Select the combination of letters that when sequentially placed in the blanks of the given letter series will complete the series. _n u_u m_m_m n_n u_

• A. u, m, n, m, u, n
• B. m, n, u, n, u, m
• C. n, m, u, n, m, u
• D. m, n, n, u, u, m