Which of the elements belong to the same group in the periodic table?

Consider the following elements and their electronic configurations

W: 1s² 2s²
X: 1s² 2s² 2p6
Y: 1s² 2s² 2p6 3s²
Z: 1s² 2s² 2p6 3s² 3p².

A. W and X only
B. Y and Z only
C. W and Y only
D. W, Y and Z only

Correct Answer: Option C

C. W and Y only