Answer:
Astra herself.
Explanation:
It will be discovered or understood by the readers, especially at the end of the story tagged "the message" that, Astra later realizes that she was the one that actually left the holo drive open. This means that, she left it open by herself.
The First sentence is where the quotation is used correctly- quotations is used with the titles of literary works and not with the name of the writers.
D...an example of the theme of tragedy :)
