VKat , "claims to be" is certainly one correct form, and it's what we use in the correct answer here, so you know it's valid! However, there are other uses of the word "claim." As my colleague Ron (quoted by hazelnut above) points out, we can also say "claim that." We can also follow "claim" directly with a noun. Let's look at each form:
Claim[noun] : We are directly making a claim on something by saying that it is or should be ours.
To claim a prize, fill
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Claim[noun] : We are directly making a claim on something by saying that it is or should be ours.
To claim a prize, fill
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