I believe that it is A. If you remember in lesson 03.03 it gave multiple examples of things that support the continental drift theory. One of them was fossils of the same organisms found in different continents.
C
The elements are Lithium and Beryllium— just look at the mass number on the periodic table
Density = mass / volume
Density = (78g) / (23cm^3)
Density = 3.4g/cm^3
