Concept:Word stress refers to the syllable that is pronounced with greater emphasis.
Explanation:The words given are stressed as follows:
"enjoy" → stress on the second syllable, /ɪnˈdʒɔɪ/.
"refer" → stress on the second syllable, /rɪˈfɜː/.
"belief" → stress on the second syllable, /bɪˈliːf/.
"reason" → stress on the first syllable, /ˈriːzən/.
Since "reason" is the only word stressed on the first syllable, it has a different stress pattern from the others.
Answer:B. reason