Yes, Reza, tell us about the context of this silly test.
Is it intended for native-English-speaking grade school children?
Or for ESL grade school children?
Or for ESL adults?
It’s really a stupid question on several levels. First, it’s not clear what the question is asking (it doesn’t actually say if it’s looking for the word with a different “u” sound). Second, it seems to be testing for a knowledge of some profoundly petty triviality. Third, it fails to consider that there is no perfectly “correct” accepted pronunciation.
Was this test made by the same geniuses who gave us “The Pineapple and the Hare” test?
It’s a horrible question. First off, those words are not pronounced the same way in different accents. Second, no matter what the accent, they all contain the same vowel, /u/. It’s just that, in some accents, it’s possible one or more words would add a /j/ sound in front of the /u/.
If I had to guess at the answer they wanted, I would say B use, since “use” will always have the /j/ sound in front of it. It still would be incorrect, however.
(And I think the context makes the sounds clear enough, even if you don’t know IPA.)