WILL GIVE BRAINLIEST!!!!!

Which of these was not an ingredient used in Roman concrete?
A. volcanic ash
B. pieces of tile
C. seawater
D. rebar

Respuesta :

I dont konw  A? just doing this to say I did

Explanation:

Ive done some research and i believe the answer to this is D. Rebar.

if it's wrong I'm very sorry