In the Reaction Below, Which Species Is Present in the Solid

In the reaction below, which species is present in the solid state?
CaCO₃ (s) + 2HNO₃ (aq) $\rightarrow$ Ca(NO₃) ₂ (aq) + H₂O (l) + CO₂ (g)

A) H₂O
B) CO₂
C) CaCO₃
D) HNO₃