A phoneme is a unit of speech sound. It is the smallest division in which sounds can be classified. These sounds are represented by letters called graphemes.
The exact number of phonemes in English depends on accents, but it is around 44. These are divided into consonant and vowel sounds.
The answer is D: both B and C. This is correct because they are the title of a book chapter. If this has helped you, consider my answer to become the Brainliest!