Final Answer:
It specifically refers to a three-letter combination that represents a single phoneme in language.. Therefore the the correct answer is b. Trigraph.
Step-by-step explanation:
A trigraph is a combination of three letters that represent a single sound or phoneme. Unlike a digraph, which comprises two letters representing one sound (like 'sh' in 'ship'), a trigraph involves three letters representing a single phoneme.
An example of a trigraph is 'tch,' as in the word 'match,' where these three letters come together to create the 'ch' sound.
Trigraphs play a crucial role in phonics and phonetics, particularly in understanding and teaching the relationship between letters and sounds in language.
They offer a deeper level of complexity in decoding words and understanding their pronunciation. Recognizing trigraphs aids in literacy development, spelling, and accurate pronunciation of words containing these combinations.
Therefore the the correct answer is b. Trigraph.