1. In the Periodic Table, what are the element symbols for M1 and M2?
(A) M1 is Ru, M2 is As(B) M1 is Rh, M2 is As(C) M1 is Ru, M2 is Sb(D) M1 is Rh, M2 is Sb(E) M1 is Pd, M2 is As