At least B. Then talk to a couple of people who sell limestone.
What shape is it? Is it machined (guessing) into nice smooth pieces? Why would this necessarily be stronger or weaker than other types of stone? You see, I don't know, so I would ask someone on the Stonecutters' Forum...
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
