Choose the correctly spelled word that should replace the highlighted word. If the highlighted word is already spelled correctly, select “No replacement required”.

The review described the critic’s comments as 'vitriolik' and needlessly harsh.

The correct answer is vitriolic.

Explanation:
1. Analyze the highlighted word: The word highlighted in the sentence is "vitriolik", which is used to describe comments that are filled with bitter criticism or malice.
2. Identify the spelling rule: Adjectives in standard English that end with the "-ik" sound derived from Latin or Greek roots (such as vitriol) end with the letters -ic rather than "-ik" or "-ick" (e.g., academic, heroic, vitriolic).
3. Correct Spelling: The accurate spelling of the word is vitriolic.
4. Evaluate the options:
• vitriolic: Correct spelling.
• vitriolick: Incorrect due to the archaic/non-standard "-ick" ending.
• vitriolik: Incorrect misspelling with "-ik".
• No replacement required: Incorrect because "vitriolik" is misspelled.

Therefore, "vitriolik" must be replaced with vitriolic.