The following diagram depicts

a$)$ a for$-$loop on the left and a while$-$loop on the right,

b$)$ a while$-$loop on the left and a for$-$loop on the right.

c$)$ an if$-$then$-$else structure on the left and an if$-$then structure on the right,

d$)$ an if$-$then structure on the left and an if$-$then$-$else structure on the right,

e$)$ None of these choices.