Answer:
b
Explanation:
It is a fossil of sea shells
i think it's B.
it looks like shells, which are from clams, and clams are living organisms. i might be wrong, though.
If the child has blood type OO and his mothes has AO type, the father must have O in his genotype: A(AO), B(BO), O(OO). The male phenotype AB exclueds him as father.