Final answer:
The misspelled word is 'knifes,' which should be spelled 'knives'. The plural form of knife involves changing the f to ves. Additionally, the [k] sound can be spelled with a C or K at the beginning of words.
Step-by-step explanation:
The misspelled word from the list provided is b) knifes, which should be spelled as knives. When pluralizing the word knife, the f is replaced with a ves. This follows the rule in English where certain nouns ending in f or fe have their plurals formed by changing the f or fe to ves to make words like knives, leaves, and wives. Therefore, knives is the correct spelling for the plural of knife.
While answering the second task about spelling [k] at the beginning of words, it is worth noting that this sound can be represented both by the letter K and by the letter C, depending on the word. For example, in the list provided, crime, critical, campaign, and congress all begin with the letter C but have the [k] sound, whereas kitchen, kindly, clinic, and kettle begin with the letter K.