Arrange the following in increasing order of their covalent character.
$CaF_{2}$,$CaCl_{2}$,$CaBr_{2}$,$CaI_{2}$
Choose the correct answer from the options given below.

• A
  $CaF_{2} < CaCl_{2} < CaBr_{2} < CaI_{2}$
• B
  $CaI_{2} < CaBr_{2} < CaCl_{2} < CaF_{2}$
• C
  $CaF_{2} < CaBr_{2} < CaCl_{2} < CaI_{2}$
• D
  $CaI_{2} < CaCl_{2} < CaBr_{2} < CaF_{2}$