Which Is Not a True Statement

Multiple Choice

Which is not a true statement?

A) A common carbonate rock is limestone
B) A common carbonate rock is dolomite and this mineral is harder than calcite because it has one extra magnesium atom
C) Calcite acts as a raw ingredient of cement that helps keeps hard pieces of shells of dead marine organisms together
D) Limestone should react to acid because it contains calcite
E) Carbonates are much more common than silicates in the Earth's crust and are commonly found on large regions of every continent