Step 1: Define allophones.
Allophones are different phonetic realizations of the same phoneme. They do not create a change in meaning but occur in different phonological environments.
Step 2: Distribution type.
- [p] (unaspirated) and [pʰ] (aspirated) occur in complementary distribution. Example in English:
- [pʰ] occurs at the beginning of stressed syllables (e.g., pin [pʰɪn]).
- [p] occurs after /s/ (e.g., spin [spɪn]).
Thus, they never overlap freely.
Step 3: Restriction.
[pʰ] has more limited distribution (only in certain environments), while [p] has broader occurrence. Therefore, (C) is correct.
Step 4: Elimination.
- (A) Contrastive distribution means minimal pairs with a meaning difference (not true here).
- (D) Interchangeability is not possible without sounding unnatural.
\[
\boxed{\text{Correct Answer: (B) and (C)}}
\]
Given the following phonological rule, which one of the options CANNOT be an output?
