Find the word which has a different sound in the part underlined

Find the word which has a different sound in the part underlined 
1.A car        B bar.   C star.   D grammar
2.A cold.     B Volleyball.  C Telephone.  D homework 
3.A study.   B Club.  C put.  D lunch
4.A farm.    B after   C talk.  D chart
5.A. calculator.  B partner.  C aunt.  Dbanana