What Formation or Formations Are Evidence That the Planet Mercury

Multiple Choice

What formation or formations are evidence that the planet Mercury may have shrunk (gotten a bit smaller) as it cooled?

A) the Caloris basin
B) the large basins in general
C) the long scarps or cliffs
D) the thin atmosphere emerging from inside the planet
E) the big ticket with size 8 crossed out and size 6 written in