Bolsa describes his new client as triste
It's asking what is the theme of the story, the message the author is trying to convey, in five complete sentences. You can word it like this:
El mensaje que el autor trata de expresar es ...
Which translates to:
The message the author is trying to convey is ...
I think the first on is correct; A
.
I think the second one is tiene; C
I think the third one is viaja; D
I think the fourth one is veo; D
I think the fifth one is Incorrect; B