Final answer:
Option 4 would pose the greatest difficulty in terms of word segmentation.
Step-by-step explanation:
Out of the given options, Option 4 would pose the greatest difficulty in terms of word segmentation. An individual attempting to break phonemes apart while listening to someone speak an unfamiliar language very quickly would be challenging. Phonemes are the smallest units of sound in a language, and breaking them apart accurately requires a good understanding of the language and its phonetic patterns