Organic nitrates present in photochemical smog may lead to breathing difficulties. The diagram illustrates one organic nitrate molecule. Which answer gives the bond angles shown in ascending order (smallest first)?
- A$1 \rightarrow 2 \rightarrow 3$
- B$2 \rightarrow 1 \rightarrow 3$
- C$3 \rightarrow 1 \rightarrow 2$
- D$3 \rightarrow 2 \rightarrow 1$