Huh? I don’t know what you’re asking? How am I supposed to answer this?
Los árboles están al lado del río.
(I believe that means, The trees are next to the river.)
If by "verbo reflexivo" it means reflexive verb, the only reasonable answer for me would be:
Yo ME PONGO la ropa.
I put on my clothes.
The correct answer is a. Coma vegetables.