Final answer:
The correct answer to fill in the blank is 'D) Consonant.' consonants like /l/ and /r/ are typically voiced and allow the air to flow freely through the mouth or nose.The two phonemes /l/ and /r/ are classified as consonants and have a fluid-like quality in speech.
Step-by-step explanation:
The correct answer is D) Consonants. Phonemes /l/ and /r/ are both examples of consonant sounds in the English language. Consonants are produced when the airflow is partially or completely obstructed in the vocal tract. In the case of /l/ and /r/, they are known as liquid phonemes because they have a fluid-like quality and can be prolonged or sustained in speech.