7683. He was given a severe warning for coming late.

✅ The correct answer is option B.
Rigorous : extremely thorough and careful.

Stern : (of a person or their manner) serious and unrelenting, especially in the assertion of authority and exercise of discipline.

Harsh : unpleasantly rough or jarring to the senses.

Strict : demanding that rules concerning behaviour are obeyed and observed.

Severe : (of a person) formal and unsmiling.

Synonym of Severe is Stern