The chances of this heart failure are very high as he has used high prohibited dangerous drugs unconsciously.

Explanation

Analysis: The phrase "high prohibited" is incorrect. The word "high" is misplaced and unnecessary in this context. It should simply be "prohibited dangerous drugs" to convey the correct meaning.High prohibited: This option is the correct one to mark, as "high prohibited" is not a proper phrase. The correct wording should be "prohibited dangerous drugs."Explanation:"Very high" correctly describes the chances of heart failure."High prohibited" is incorrect; "prohibited dangerous drugs" is the correct phrase."Drugs" is correctly used to refer to the substances."Unconsciously" is correctly used to describe the manner in which the drugs were taken.So, the correct answer is B) High prohibited.