The reaction sodium carbonate with excess calcium hydroxide produces:

The correct option is A Caustic soda
The reaction sodium carbonate with calcium hydroxide produces sodium hydroxide (NaOH), it involves heating of 10% solution of $N{a}_{2}C{O}_3$ with a little excess of milk of lime $Ca(OH{)}_2$
$N{a}_{2}C{O}_3+Ca(OH{)}_2\to CaC{O}_3\downarrow +2NaOH$