Concept:The word "crest" contains the short vowel sound /e/.
Explanation:In "crest", the letter "e" gives the vowel sound /e/, as in "bed".
Check each option for the same vowel sound.
A. "goitre" has the /ɔɪ/ sound.
B. "breakfast" is pronounced /ˈbrɛkfəst/; the "ea" here sounds as /e/.
C. "firm" has the /ɜː/ sound.
D. "wheat" has the /iː/ sound.
So only "breakfast" has the same vowel sound as "crest".
Answer:B. breakfast