Concept:Identify the vowel sound in the given word and match it with the option that contains the same sound.Explanation:The word "crest" is pronounced as /krest/.Its vowel sound is the short /e/ sound.Now check each option:"goitre" has the /ɔɪ/ sound."wheat" has the /iː/ sound."breakfast" contains the short /e/ sound, as in "break"."firm" has the /ɜː/ sound.Only "breakfast" shares the same vowel sound as "crest".Answer:C. breakfast