X, Y and Z are elements that are all located in Groups 13, 14 and 15 of the Periodic Table. X is in the same group in the Periodic Table as Y. Y and Z are both in Period 3. The first ionisation energy of X is higher than that of Y. The melting point of Z is lower than that of Y. Y and Z each form chlorides that are white solids. When these white solids react with water, they give solutions with a pH of less than 4. Which row in the table gives the possible identities of X and Y?
- AX: B; Y: Al
- BX: Ge; Y: Si
- CX: As; Y: P
- DX: N; Y: P