Coordination and response — practice question

The diagrams illustrate three kinds of neurones. Which order shows the direction in which impulses travel in a reflex action?

• A$L \rightarrow M \rightarrow N$
• B$M \rightarrow L \rightarrow N$
• C$M \rightarrow N \rightarrow L$
• D$N \rightarrow M \rightarrow L$