I wouldnt know.......................................
Alliteration is when words begin with the same sound or the same cluster of sounds in succession. Knowing this definition, you can look on the page and easily find what the example is.
Pretty sure your answer is A, however it admittedly could be C. Are there any surrounding sentences, or is this one standalone?
Answer:
A. It is ironic that destroying the thing keeping them afloat may save them.
Explanation: