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

I. Find the word which has a different sound in the underlined part.
A. hearB. fearC. dearD. wear
A. nearB. appearC. bearD. idea
A. hereB. thereC. seriesD. sphere
A. MaryB. airC. chairD. marry
A. prepareB. carryC. shareD. fair