Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?

• A

  The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group
• B

  In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group
• C

  Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens
• Correct answer
  D

  In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

Hence, the correct answer is option: 'D'.