Question

ZnCO3, CL2, NaCL, Zn(NO3)2, Zn.

THANK YOU!
DrBob222
It isn't quite that simple. All of them might be bases depending upon what they react with. However, in the context of your question, and I assume this is at an elementary level, ZnCO3 is my choice. It will react with acids to give CO2 and H2O from the CO3^-2.
Sam
Thank you! That is what I was thinking.