Correct Answer: MTRALMTA

Solution : Given:
L_ _RALMT_ _ _ _TRALM_R_

To fill the series we have to divide the series – L_ _RA / LMT_ _ / _ _TRA / LM_R_

Let's check each option –
First option: TRMALMTA ; L TR RA / LMT MA / LM TRA / LM T R A (No repeated pattern has been found)
Second option: MRTLAMTA ; L MR RA / LMT TL / AM TRA / LM T R A (No repeated pattern has been found)
Third option: MTRALMTA ; L MT RA / LMT RA / LM TRA / LM T R A (LMTRA is repeated in the series)
Fourth option: MTRLAMTA ; L MT RA / LMT RL / AM TRA / LM T R A (No repeated pattern has been found)

So, the series becomes→LMTRALMTRALMTRALMTRA. Hence, the third option is correct.