If the sum of the circumferences of two circles with radii $R_{1}$ and $R_{2}$ is equal to the circumference of a circle of radius $R$,then
- A$R_{1} + R_{2} < R$
- B$R_{1} + R_{2} > R$
- CNothing definite can be said about the relation among $R_{1}, R_{2}$ and $R$
- D$R_{1} + R_{2} = R$
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