— _____, could you tell me the way to the bank?

— Yes, go straight and you will find it.[ ]

A. Hello

B. Excuse me

C. Hi

常温常压下，对密度公式ρ= m/V的理解，下列说法中正确的是

A．同种物质，密度跟质量成正比

B．同种物质，密度跟体积成反比

C．同种物质，密度跟质量和体积无关

D．不同物质，体积跟密度成反比