A.Oxygen and Neon have the same number of valence electrons : False.
Elements which are present in the same group have same number of valence electrons. Oxygen and Neon are present in the same period but not in the same group. Hence they do not have same number of valence electrons.
B.Oxygen and Neon are in the same group or family : False.
The vertical columns represent the group on periodic table. Oxygen and Neon are in same horizontal row which means they are in the same period.
C.Oxygen and Sulfur have the same number of electron shells : False
The elements present in the same period have same number of shells. Oxygen and Sulfur are present in the same group. That means they will have same number of valence electrons but not the same number of shells.
D.Oxygen and Sulfur have the same number of valence electrons : True.
Since they are present in the same group, they have same number of valence electrons.
E.Oxygen and Sulfur are most similar because they are in the same family and have similar chemical properties : True.
Elements which are present in the same group have same number of valence electrons. The chemical properties of the elements are decided by the valence electrons. Since oxygen and sulfur have same number of valence electrons, they tend to show similar properties.
F.Oxygen and Neon have the same number of electron shells : True.
Elements in the same period have same number of electron shells.