Which word contains the long vowel /e/ sound?

The word "feet" contains the long vowel /e/ sound. In phonetics, a long vowel sound means that the vowel is pronounced the same as its name in the alphabet, rather than being shortened in pronunciation. In this case, "feet" contains the long vowel sound similar to the letter "e", creating a prolonged, clear sound that is recognizable as a long [iː] vowel sound.

In contrast, the other words demonstrate different pronunciations of the vowel. "Feed" also features a long vowel sound, specifically the long /ē/ as in "ee," which some might identify as correct. However, in the context of the question asking for the long vowel /e/ sound specifically, "feet" aligns perfectly with that request because it uses the long vowel sound in a straightforward manner that typifies the spelling "ee."

The other options, "fed" and "fet," feature a short vowel sound, while "fed" has a distinctly different pronunciation that does not align with the long vowel sound criteria. Therefore, the confirmation that "feet" exemplifies the long vowel /e/ sound is salient, as it accurately reflects the characteristics associated with this particular sound in English.