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I haven't heard of this, quite rom web resourthat but I'll see what I can get from web resources... if you're patient enough :/ in the mean time you can try and get help from the chat :)
oops! i meant to say quite sorry about that but will see what i can get from web resources... my computer messed up lol
the choices are a) cast fossil b) petrified fossil c) mold fossil d)trace fossil
from the read I just had, a fossil tooth is a type of body fossil... i'm not quite sure which this is but it seems to me the answer will be C. that said, I'm not sure so I'll have to read a little bit more before I can give you a concrete answer
cast and mold fossils are the same so I'll eliminate that, here's why http://en.wiktionary.org/wiki/cast_fossil and http://en.wiktionary.org/wiki/mold_fossil
the other options also don't seem to be the answer... taking a look at casts and molds again, one of those actually is the answer but I can't be sure since they have very similar definitions, I can't really tell... sorry I wasn't of much help but if anything comes up I'll let you know
you may use your own discretion to answer but this might also help http://wiki.answers.com/Q/What_is_a_mold_and_cast_fossil