The Sound System And Morphology

The best answer is "C."

Not A: That describes phonology.
Not B: That describes syntax.
Not D: That describes language acquisition.

Answer "C" is correct because "sandwich" ends in a sound that's similar to /s/.

Answer "A" is correct because "appear" ends in a voiced sound (but not /d/).

Grammar and pronunciation are sometimes related, as we can see from the way the -s and -ed endings change their pronunciation, depending on what comes before them.
Also, word stress can sometimes show the difference between nouns and verbs, as in reCORD (a verb) and REcord (a noun).

Answer "C" is correct because the word "repeat" ends in the phoneme /t/.

Answer "B" is correct because "rabbit" ends in a voiceless sound (but not a sound that's similar to /s/).

Answer "A" is correct because "alligator" ends in a voiced sound (but not a sound that's similar to /s/).

The correct answer is "A." When "use" and some other words are verbs, the end in a voiced sound. When they're nouns, they end in a voiceless sound.

Answer "B" is correct because the word "approach" ends in a voiceless sound (but not /t/).

The answer is "A." If "learned" were being used as a past tense/past participle of the verb, it would have just one syllable: /lərnd/ (or possibly /lərnt/--"learnt").