The correct answer is option 1 i.e. evidense is the misspelt word. Key Points Word evidense is misspelt. The correct spelling of the word is 'evidence' Evidence is a noun which means the available body of facts or information indicating whether a belief or proposition is true or valid. Example: ​Her statement to the police was used in evidence against him. Hence, option 1 is correct. Additional Information The other words are correctly spelt. Let's see the meaning of the other words: Dangerous means likely to cause injury or damage Treatment means the use of medicine or medical care to cure an illness or injury Effective means successfully producing the result that you want