Discussion
According to Miller (1990) the two fundamental problems in speech perception depending on context are :
Answer: A
The two problems are that speech is continuous and a single phoneme sounds different in different contexts.
The first is the segmentation problem: in the acoustic signal there are no clear pauses between words, yet listeners hear separate words. The second is the lack of invariance: because of coarticulation, the same phoneme is pronounced differently depending on the sounds around it, so the /d/ in 'dee' and 'doo' are acoustically quite different. Context helps listeners solve both problems.
Speech is not monotonous; it varies in pitch and stress, so options C and D are wrong. Option B states the variability problem the wrong way round: the issue is that one phoneme has many acoustic forms.
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