Choose the word that from the other three in the position of primary stress: frightening, prosperous, confident, essential

Explain:

A. frightening /ˈfraɪ.tən.ɪŋ/ (adj): full of fear

B. prosperous /ˈprɒs.pər.əs/ (adj): prosperous, prosperous

C. confident /ˈkɒn.fɪ.dənt/ (adj): confident

D. essential /ɪˈsen.ʃəl/ (adj): necessary, essential

Answer D has stress on the second syllable, the rest of the answers have stress on the first syllable.

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