The correct answer is option 3 i.e. error lies in 'control measures do not seem to have been effective.' [ alt="clipboard" src="//storage.googleapis.com/tb-img/production/20/09/clipboard.png" style="width: 38px; height: 38px;">Explanation- In option 3, The usage of the perfect infinitive is incorrect Instead use an infinitive only i.e. 'to be' The concept is: Perfect infinitive should be used if the action expressed of the infinitive precedes the action of the finite verb. In the question, the situation for the perfect infinitive is not used; Hence, we will not use the perfect infinitive. Let's see an example: He admitted to have been there. (In this sentence usage of the perfect infinitive is correct)[ alt="right (1)" src="//storage.googleapis.com/tb-img/production/20/08/right%20%281%29.png" style="width: 20px; height: 20px;"> Everyone desires to get a house. (In this sentence the usage of an infinitive is correct.)[ alt="right (1)" src="//storage.googleapis.com/tb-img/production/20/08/right%20%281%29.png" style="width: 20px; height: 20px;">​ The correct answer is: Though Pakistan has claimed that it is taking action to eliminate the breeding grounds of insects, Its control measures do not seem to be effective.