In the main group elements $(i)$ as we proceed down the same group in the periodic table and $(ii)$ as we proceed from left to right in the same period,the atomic radius

• A
  $(i)$ Increases continuously; $(ii)$ Decreases continuously
• B
  $(i)$ Decreases continuously; $(ii)$ Increases continuously
• C
  $(i)$ Increases continuously; $(ii)$ Decreases up to the group $IV$ and then increases up to the end of the period.
• D
  $(i)$ Decreases continuously; $(ii)$ Decreases up to the group $IV$ and then increases up to the end of the period.