Which of the Following Compounds Is Likely to Adopt the Cesium

Multiple Choice

Which of the following compounds is likely to adopt the cesium chloride structure?

A) AgCl, ρ = 0.62
B) MgO, ρ = 0.51
C) CaO, ρ = 0.71
D) RbI, ρ = 0.68
E) TlCl, ρ = 0.90