Choose the world which has the underlined part pronounced differently form the others

I/ Choose the world which has the underlined part pronounced differently form the others.

1.A. customer ​​ B. stop​​ C. question(st)
2.A. listen​​​ B. start​​ C. sticker
3.A. study​​​B. castle​ C. post​
4.A.language B.article C.plastic(l)
5.A.social b.useful c.talk
6.a.recycle b.always c.village
7.a.stamp b.station c.listen(st)
8.a. single b. usually c. article(l)
9.a.phone b.pillow c.hospital(o)
10.a.police b.post c.go
11.a.throw b.donate c.bottle
12.a.homes b.stops c.bags(s)
13.a.units b.parks c.ways
14.a.cups b.trees c.papers
15.a.bins b.topics c.students