To determine the correctly spelled word among the given options, let's analyze each option carefully. The correct spelling of the word refers to the one widely accepted and documented in English dictionaries.

1. Option 1: InevitabIe 
   This option uses the letter 'I' instead of 'l' (lowercase 'L') in the word "inevitable." This is incorrect as the correct spelling requires the word "inevitable," with 'l' being part of the word.
2. Option 2: InevitabIe 
   This option again uses 'I' in place of 'l' (lowercase 'L'), which is incorrect.
3. Option 3: InevatabIe 
   The letter 'i' is replaced with 'a' after 'v,' which is incorrect in the spelling of "inevitable."
4. Option 4: InevatabIe 
   Similar to Option 3, this option also incorrectly uses 'a' in place of 'i' following the 'v,' making it an incorrect spelling of "inevitable."

The word "inevitable" is correctly spelled as it is commonly accepted according to English dictionaries: "inevitable."

In conclusion, none of the options provided match the correct spelling of the word. However, given that Option 1 and Option 2 are identical and do not directly spell the correct version either due to the 'I/l' difference, these can be considered closer attempts than Options 3 and 4. However, if the original question intended one of these options as correct due to context not visible here, this explanation adheres to proper spelling conventions.