$$0.\overline{234} +0.\overline{342} +0.\overline{432} =1.\overline{009} $$$$=1\frac 1{111}$$. 
A recurring decimal can also be written by putting a bar over the digits that repeat. Thus, $$0.\overline {123}$$ means $$0.123123\cdots $$. The sum of $$0.\overline {234}$$, $$0.\overline {342}$$, and $$0.\overline {432}$$ is~\uline{~~~~~~~~~~}~. 
Options:
a) $$1$$ 
b) $$1.01$$ 
c) $$1\frac1{111}$$ 
d) $$1.009$$ 