What is the spelling of the /k/ sound in the word 'click'?

The correct choice is that all of the given options represent valid spellings for the /k/ sound in different contexts. In the word 'click', the /k/ sound is spelled with the letter 'C', followed by the letters 'l' and 'i', and then the 'ck' which contributes to the final /k/ sound.

Each option demonstrates a way the /k/ sound can be represented in English. The letter 'K' appears in words like 'kite' and 'kit', while the 'C' is common in words such as 'cat' and 'cane'. The spelling 'CK' is typically used in contexts where the /k/ sound appears at the end of a syllable, as in 'back' or 'snack'.

This multiplicity in spelling highlights the irregularities and complexities of English spelling conventions. Thereby, recognizing that all these letters can denote the /k/ sound in various words illustrates the flexibility and adaptability of English orthography.