Why is "Pruebas la fresa" not a valid answer here? Omitting the first person pronoun (e.g. "Pruebo la fresa") would be correct, wouldn't it? So why not in this case?
yes that would be valid. you should report it
Yes. It should be correct. Please report it.
"Tú prueba la fresa" would be be command form of this sentence, but it's not accepted. This would be fine, but it's given as one of the options.
Why not muestra which means sample?
so muestra, pruebas and se work here? i guess the context will determine which word to use?
Why not "Gustas la fresa."??