Choose the odd one out.

RAT
OUT
BIT
LOT E. SUW

The answer is E. SUW.

The other four options (RAT, OUT, BIT, and LOT) all have three letters. SUW has four letters.

RAT is an animal. OUT is a preposition. BIT is a piece of information. LOT is a large amount of something. SUW is not a word in the English language.