Select the CORRECTLY spelt word.

The correct option is "cigarette".

Let's analyze each option step-by-step to identify the spelling errors and find the correctly spelt word:

1. "embarass": This is incorrect. The correct spelling is "embarrass". It requires a double 'r' and a double 's' (e-m-b-a-r-r-a-s-s).
2. "enviroment": This is incorrect. The correct spelling is "environment". It includes a silent 'n' before the suffix "-ment" (e-n-v-i-r-o-n-m-e-n-t).
3. "seperete": This is incorrect. The correct spelling is "separate". The vowel after the letter 'p' should be 'a', not 'e' (s-e-p-a-r-a-t-e).
4. "cigarette": This is correct. The spelling follows the standard pattern for this word (c-i-g-a-r-e-t-t-e) with a double 't' and a silent 'e' at the end.