Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series. m_tq_ml_qrm_tq_m_t_r

l, r, t, l, r, l, q l, l, q, r, l, r, t l, q, r, l, l, r, t l, t, r, l, l, r, q

l, r, t, l, r, l, q

m l t q r / m l t q r / m l t q r / m l t q r l , r , t , l , r , l , q