Mark the letter A,B,C or D on your answer sheet to show the underlined part that needs correction in each of the following questions

Mark the letter A,B,C or D on your answer sheet to show the underlined part that needs correction in each of the following questions
1. Last year, expensive apartment buildings (A) were built in this big town and make (B) the cost of (C) living (D) increase.
2. Community (A) activities (B) have organnized for the past five months in order to help the locals (C) feel less (D) stressed.
3. Free education for the poor (A) has been carried out (B) for ten years in order (C) to poor children (D) can go to school.