"A combination of letters in which you can hear the sound of each letter is called a <u>blend</u>." As a result, option (c): "blend" is the combination of letters.
<h3>What is a combination of letters?</h3>
Blends of letters:
Letter blends refer to certain combinations of two or more consonant letters. To create specific sounds, letter blends appear at the beginning or end of words. Each letter's sound can be heard in letter blends.
Check out the link below to learn more about a combination of letters;
brainly.com/question/13367115
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Soporific is an English word which means - cause to sleep. The origin of this word is Latin. It comes from the Latin word sopor - deep sleep.