$50 \ mL$ of $0.1 \ M$ of a weak acid $HA$ is titrated with $0.1 \ M$ of $NaOH$. The ionization constant of $HA$ $(K_a)$ is $1.8 \times 10^{-5}$. Using the given information and from the options shown below,the best indicator for the titration of $HA$ with $NaOH$ is $....$

• A
  Methyl orange (changes colour from red to yellow as the $pH$ changes from $3.2$ to $4.4$)
• B
  Methyl red (changes colour from red to yellow as the $pH$ changes from $4$ to $6.3$)
• C
  Phenolphthalein (changes from colourless to pink as the $pH$ changes from $8.3$ to $11$)
• D
  Sodium salt of Alizarin yellow (changes colour from yellow to red as the $pH$ changes from $10$ to $12$)