Which of the Following Statements Is Incorrect Concerning the 3d,4d,and

Which of the following statements is incorrect concerning the 3d,4d,and 5d transition series?

A) There is a large increase in radius in going from the 3d to the 4d metals.
B) There is a general increase in size going left to right across each series due to an increasing number of electrons.
C) Hafnium through mercury exhibit what is referred to as the lanthanide contraction.
D) The separation of hafnium and zirconium found together in nature is difficult due to their similar chemistries,which are attributed to their virtually identical sizes.
E) The transition metal from a period 6 group is similar in size to the peroid 5 transition metal sitting above it on the periodic table.