Phenolphthalein is not a suitable indicator for the titration between which of the following?

$A$ $0.1 \ N$ solution of $Na_2CO_3$ is titrated with $0.1 \ N$ $HCl$ solution. The best indicator to be used is

Given below are two statements.
Statement $I:$ In the titration between a strong acid and a weak base,methyl orange is a suitable indicator.
Statement $II:$ For the titration of acetic acid with $NaOH$,phenolphthalein is not a suitable indicator.
In the light of the above statements,choose the most appropriate answer from the options given below:

If a very small amount of $HPh$ (phenolphthalein) is added to a $0.1 \ M$ aqueous solution of $CH_3COONa$,the fraction of the indicator that exists in the colourless form is:
$[K_b(CH_3COO^{-}) = 10^{-9}, pK_a(HPh) = 9.6, \log 2 = 0.3]$

Starch can be used as an indicator for the detection of traces of

Methyl orange gives $.......$ color in an acidic medium.