The correct option is C Simile
The given options are all figures of speech.
An Alliteration is a figure of speech in which closely connected words begin with the same consonant sound. For example, 'the big bad bear attacked all the rabbits near the river'.
A Metaphor compares two different things, even though there is nothing similar between them. It states that one thing is another. For example, 'Life is a highway'.
A Simile is just like a metaphor, but it uses direct comparison words such as 'as' and 'like'. For example, 'you look a lot like your sister'.
Personification is used to bring inanimate objects to life. For example, 'the clouds roared into the dark sky'.
The given sentence presents a comparison between 'the teeth of the shark' and 'knives'. It uses a direct comparison word 'like'. Hence option B is correct.
The other options are incorrect as the sentence does not present these figures of speech.