The given options represent groups of letters that, when unscrambled, form names of different seasons:
- UMRSME - Unscrambles to SUMMER
- EIWNTR - Unscrambles to WINTER
- PIGRSN - Unscrambles to SPRING
- LCUOD - Unscrambles to CLOUD
As we analyze each option, the first three options, when unscrambled, form the names of three different seasons: Summer, Winter, and Spring. The fourth option, LCUOD, does not unscramble to a season. Instead, it unscrambles to CLOUD, which is an atmospheric phenomenon and unrelated to the concept of seasons.
Therefore, the odd one out is LCUOD.